ESP32M4/M16/E4/E16 WiFi Modules Draft Ver 0.10 Jan. 2020 ESP32M16 Series WiFi module uses Expressif ESP32 D0WD SoC. Its footprint is exactly the same as that of Expressif ESP32 WROOM-32 module. The difference:
Tighter tolerance RF components with wider operating temperature range are used to provide consistent and improved RF circuit performance from -40oC to +105oC. An ISSI 4 MB flash, IS25LP032-JBLE; or 16 MB flash, IS25LP128-JBLE with operating temperature range from -40oC to +105oC is used . Specifications:
CPU Expressif ESP32 D0WD, Xtensa dual core 32 bit LX6 microprocessors, up to 600 MIPS. 34 GPIO pins 12 bit SAR ADC up to 18 channels 2x8 bit DAC 10xtouch sensors 4xSPI, 2xI2S, 2xI2C, 3xUART 1 host (SD/eMMC/SDIO), 1 slave (SDIO/SPI) Ethernet MAC interface with dedicated DMA and IEEE 1588 support CAN 2.0, IR (TX/RX), Motor PWM LED PWM up to 16 channels Hall sensor Security Secure boot, flash encryption Cryptographic hardware acceleration, AES, Hash
(SHA-2), RSA, ECC 38 castellated pins. Integrated PCB trace antenna or u.FL connector Operation voltage: 3.0V to 3.6V ESP32E4. ESP32-D0WD 4MB, IS25LP032-
JBLE 18x25.5 u.FL JBLE 18x25.5 PCB trace
-40oC to +105oC -40oC to +105oC -40oC to +105oC ESP32F16 ESP-D0WD ESP32M16 ESP32-D0WD 16MB, IS25LP128-JBLE 16MB, IS25LP128-JBLE 16MB, IS25LP128-JBLE 18x25.5 PCB trace ESP32E16. ESP32-D0WD 20x29.5 PCB trace
-40oC to +105oC -40oC to +105oC 18x25.5 u.FL
$4.33 Sample 03/2020
$4.49 Sample 03/2020 448KB ROM, 520KB SRAM, 4MB or 16 MB flash 16KB SRAM in RTC QPSI supports multiple flash/SRAM chips Internal 8 MHz oscillator with calibration Internal RC oscillator Embedded 40 MHz crystal oscillator External 32 KHz crystal oscillator Two timer group. 2x64 bit timers and 1x main watch dog in each group WiFi Features 802.11 b/g/n, 802.11n (2.4 GHz).up to 150 Mbps WMM TX/RX A-MPDU, RX A-MSDU Immediate Block ACK Defragmentation Automatic Beacon monitoring (hardware TSF) 4x virtual WiFi interfaces Model Summaries ESP32M4 ESP32F4. ESP32-D0WD ESP32-D0WD 4MB, IS25LP032-JBLE 4MB, IS25LP032-
18x25.5 PCB trace
-40oC to +105oC module SoC Flash memory Size WIFI Antenna Max TX Operating temp. Price at 1K pcs Availability
$3.46 1 ESP32M4/M16/E4/E16 WiFi Modules Draft Ver 0.10 Jan. 2020 Table Of Contents 1. Introduction .......................................................................................................................................................... 3 Module Performance Enhancement .................................................................................................................... 3 ESP32M16 ........................................................................................................................................................... 3 ESP32F16 ............................................................................................................................................................ 4 ESP32M4 ............................................................................................................................................................. 4 ESP32E16 ............................................................................................................................................................ 4 ESP32E4 .............................................................................................................................................................. 4 2. Product Descriptions ............................................................................................................................................ 5 Block Diagram of ESP32 D0WD.......................................................................................................................... 5 Mechanical Drawings ........................................................................................................................................... 6 Pin Assignments of ESP32M16 ........................................................................................................................... 7 Pin Function ......................................................................................................................................................... 8 Mounting ESP32M4 on the Host PCB ................................................................................................................. 9 3. Firmware Development ...................................................................................................................................... 10 4. ESP32M4 Evaluation Board .............................................................................................................................. 11 ESP32M4 EvaluationBoard Schematics ........................................................................................................... 12 5. Miscellaneous .................................................................................................................................................... 13 Soldering Temperature-Time Profile for Re-Flow Soldering ............................................................................. 13 Cautions, Design Notes, and Installation Notes ................................................................................................ 13 Packaging and Lot Number ............................................................................................................................... 17 FCC Label .......................................................................................................................................................... 17 Revision History ..................................................................................................................................................... 18 Contact Us ............................................................................................................................................................. 19 2 ESP32M4/M16/E4/E16 WiFi Modules Draft Ver 0.10 Jan. 2020 1. Introduction ESP32M16 Series use Expressif ESP32 D0WD SoC. Its footprint is the same as that of Expressif ESP32-
WROOM module. There are two CPU cores that can be individually controlled, and the CPU clock frequency is adjustable from 80 MHz to 240 MHz. The main CPU can be powered off and use the low power co-processor to constantly monitor the peripherals for changes or crossing of thresholds. ESP32 integrates a rich set of peripherals, ranging from capacitive touch sensors, Hall sensors, SD card interfaces, Ethernet, high-speed SPI, UART, I2S, and I2C. Module Performance Enhancement Improvements of ESP32M4, ESP32M16, ESP32E4, ESP32E16 are using:
Tighter tolerance RF components with wider operating temperature range are used to provide consistent and improved RF circuit performance from -40oC to +105oC. An ISSI 4 MB flash, IS25LP032-JBLE; or 16 MB flash, IS25LP128-JBLE with operating temperature range from -40oC to +105oC. ESP32M4, ESP32M16, ESP32E4, and ESP32E16 are referred as ESP32M16 in this product specifications. ESP32M16 Uses an Expressif ESP32 D0WD SoC. 448KB ROM, 520KB SDRAM 3 ESP32M4/M16/E4/E16 WiFi Modules Draft Ver 0.10 Jan. 2020 16 MB flash, ISSI, IS25LP128-JBLE Integrated PCB trace antenna. Size: 18x25.5mm. ESP32F16 The same as ESP32M16 Integrated PCB trace inverted F antenna size: 20x29.5mm ESP32M4 The same as ESP32M16 448KB ROM, 520KB SDRAM 4MB flash, ISSI, IS25LP032-JBLE. Integrated PCB trace antenna size: 18x25.5mm ESP32E16 Uses an Expressif ESP32 D0WD SoC. 448KB ROM, 520KB SDRAM 16 MB flash, ISSI, IS25LP128-JBLE An u.FL connector for external antenna. Size: 18x25.5mm. ESP32E4 Uses an Expressif ESP32 D0WD SoC. 448KB ROM, 520KB SDRAM 4 MB flash, ISSI, IS25LP032-JBLE An u.FL connector for external antenna. Size: 18x25.5mm. 4 ESP32M4/M16/E4/E16 WiFi Modules Draft Ver 0.10 Jan. 2020 2. Product Descriptions Please download specifications of SoC ESP32 D0WD from this webpage. https://www.fanstel.com/wirelessdocument Specifications of the original module, ESP32-WROOM can also be downloaded from the same webpage. Block Diagram of ESP32 D0WD The following is a block diagram of Expressif ESP32 D0WD WiFi SoC. 5 ESP32M4/M16/E4/E16 WiFi Modules Draft Ver 0.10 Jan. 2020 Mechanical Drawings The followings are mechanical drawings of ESP32M16, top view. 6 ESP32M4/M16/E4/E16 WiFi Modules Draft Ver 0.10 Jan. 2020 Pin Assignments of ESP32M16 The followings are ESP32M16 pin assignment. Pin functions are in a table in next section. Please refer to Espressif ESP32 D0WD and ESP32 WROOM Product Specifications for detailed descriptions and features supported. ESP32M16 pin assignments. ESP32M16 pin#
1 2 3 4 5 ESP32 D0WD pin#
49 46 9 5 8 Ground Descriptions pin name GND 3V3 EN Sensor-VP GPIO36, ADC1_CH0, RTC_GPIO0 Sensor_VN GPIO39, ADC1_CH3, RTC_GPIO3 Module enable signal, active high DC power supply 7 ESP32M4/M16/E4/E16 WiFi Modules Draft Ver 0.10 Jan. 2020 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 10 11 12 13 14 15 16 17 18 49 20 28 29 30 31 32 33 21 22 23 24 25 27 34 35 38 42 40 41 39 36 49 49 Pin Function IO34 IO35 IO32 IO33 IO25 IO26 IO27 IO14 IO12 GND IO13 SD2 SD3 CMD CLK SD0 SD1 IO15 IO2 IO0 IO4 IO16 IO17 IO5 IO18 IO19 NC IO21 RXD0 TXD0 IO22 IO23 GND GND PAD GPIO34, ADC1_CH6, RTC_GPIO4 GPIO35, ADC1_CH7, RTC_GPIO5 GPIO32, XTAL_32K_P(32.768 kHz crystal input), ADC1_CH4,Touch9, RTC_GPIO9 GPIO33, XTAL_32K_N(32.768 kHz crystal output), ADC1_CH5,Touch8, RTC_GPIO8 GPIO25, DAC_1, ADC2_CH8, RTC_GPIO6, EMAC_RDX0 GPIO26, DAC_2, ADC2_CH9, RTC_GPIO7, EMAC_RDX1 GPIO27, ADC2_CH7, Touch7, RTC_GPIO17, EMAC_RX_DV GPIO14, ADC2_CH6, Touch6, RTC_GPIO16, MTMS, HSPICLK, HS2_CLK, SD_CLK, EMAC_TXD2 GPIO12, ADC2_CH5, Touch5, RTC_GPIO15, MTDI, HSPIQ, HS2_DATA2, SD_DATA2, EMAC_TXD3 Ground GPIO13, ADC2_CH4, Touch4, RTC_GPIO14, MTCLK, HSPID, HS2_DATA3, SD_DATA3, EMAC_RX_ER GPIO9, SD_DATA2, SPIHD, HS1_DATA2, U1RXD GPIO10, SD_DATA3, SPIWP, HS1_DATA3, U1TXD GPIO11, SD_CMD, SPICSO, HS1_CMD, U1RTS GPIO6, SD_CLK, SPICLK, HS1_CLK, U1CTS GPIO7, SD_DATA0, SPIQ, HS1_DATA0, U2RTS GPIO8, SD_DATA1, SPID, HS1_DATA1, U2CTS GPIO15, ADC2_CH3, Touch3, MTDO, HSPICS0, RTC_GPIO13, HS2_CMD, SD_CMD, EMAC_RXD3 GPIO2, ADC2_CH2, Touch2, HSPIWP, RTC_GPIO12, HS2_DATA0, SD_DATA0 GPIO0, ADC2_CH1, Touch1, RTC_GPIO11, CLK_OUT1, EMAC_TX_CLK GPIO4, ADC2_CH0, Touch0, HSPIHD, RTC_GPIO10, HS2_DATA1, SD_DATA1, EMAC_TX_ER GPIO16, HS1_DATA4, U2RXD, EMAC_CLK_OUT GPIO17, HS1_DATA5, U2TXD, EMAC_CLK_OUT_180 GPIO5, VSPICS0, HS1_DATA6, EMAC_RX_CLK GPIO18, VSPICLK, HS1_DATA7 GPIO19, VSPIQ, U0CTS, EMAC_TXD0 GPIO21, VSPIHD, EMAC_TXEN GPIO3, U0RXD, CLK_OUT2 GPIO1, U0TXD, CLK_OUT3, EMAC_RXD2 GPIO22, VSPIWP, U0RTS, EMAC_TXD1 GPIO23, VSPID, HS1_STROBE Ground Ground pad 8 ESP32M4/M16/E4/E16 WiFi Modules Draft Ver 0.10 Jan. 2020 Mounting ESP32M4 on the Host PCB The following figure shows recommended mounting of ESP32M4 module on the host PCB. For the best WiFi range performance, the antenna area of module shall extend 6 mm outside the edge of host PCB board, or 6 mm outside the edge of a ground plane. The next choice is to place a module on a corner of host PCB, the antenna area shall extend 6 mm from the edge of ground plane. Ground plane shall be at least 5 mm from the edge of the antenna area of module. We dont recommend mounting ESP32M4 module in the middle of a host PCB. 9 ESP32M4/M16/E4/E16 WiFi Modules Draft Ver 0.10 Jan. 2020 3. Firmware Development Please use Expressif Firmware development environment for ESP32-WROOM module. Here are the ESP32-related must-have resources. ESP32 BBS This is an Engineer-to-Engineer (E2E) Community for ESP32 where you can post questions, share knowledge, explore ideas, and help solve problems with fellow engineers. ESP32 GitHub ESP32 development projects are freely distributed under Espressifs MIT license on GitHub. It is established to help developers get started with ESP32 and foster innovation and the growth of general knowledge about the hardware and software surrounding ESP32 devices. ESP32 Tools This is a webpage where users can download ESP32 Flash Download Tools and the zip file ESP32 Certification and Test. ESP-IDF This webpage links users to the official IoT development framework for ESP32. ESP32 Resources This webpage provides the links to all available ESP32 documents, SDK and tools. 10 ESP32M4/M16/E4/E16 WiFi Modules Draft Ver 0.10 Jan. 2020 4. ESP32M4 Evaluation Board TO BE PROVIDED. 11 ESP32M4/M16/E4/E16 WiFi Modules Draft Ver 0.10 Jan. 2020 ESP32M4 EvaluationBoard Schematics Evaluation board EV-ESP32M4 schematics:
12 ESP32M4/M16/E4/E16 WiFi Modules Draft Ver 0.10 Jan. 2020 5. Miscellaneous Soldering Temperature-Time Profile for Re-Flow Soldering Maximum number of cycles for re-flow is 2. No opposite side re-flow is allowed due to module weight. Cautions, Design Notes, and Installation Notes Failure to follow the guidelines set forth in this document may result in degrading of the productsfunctions and damage to the product. Design Notes
(1) Follow the conditions written in this specification, especially the control signals ofthis module.
(2) The supply voltage has to be free of AC ripple voltage (for example from a battery or a low noise regulator output). For noisy supply voltages, provide a decoupling circuit (for example a ferrite in series connection and a bypass capacitor to ground of at least 47uF directly at the module).
(3) This product should not be mechanically stressed when installed.
(4) Keep this product away from heat. Heat is the major cause of decreasing the life of these products. spikes.
(5) Avoid assembly and use of the target equipment in conditions where the products' temperature may exceed the maximum tolerance.
(6) The supply voltage should not be exceedingly high or reversed. It should not carry noise and/or 13 ESP32M4/M16/E4/E16 WiFi Modules Draft Ver 0.10 Jan. 2020
(7) this product away from other high frequency circuits. Notes on Antenna and PCB Layout
(1) Dont use a module with internal antenna inside a metal case.
(2) For PCB layout:
Avoid running any signal line below module whenever possible, No ground plane below antenna, If possible, cut-off the portion of main board PCB below antenna. Installation Notes
(1) Reflow soldering is possible twice based on the time-temperature profile in this data sheets.Set up the temperature at the soldering portion of this product according to this reflow profile.
(2) Carefully position the products so that their heat will not burn into printed circuitboards or affect the other components that are susceptible to heat.
(3) Carefully locate these products so that their temperatures will not increase due tothe effects of heat generated by neighboring components.
(4) If a vinyl-covered wire comes into contact with the products, then the cover will melt and generate toxic gas, damaging the insulation. Never allow contact between the cover and these products to occur.
(5) This product should not be mechanically stressed or vibrated when reflowed.
(6) If you want to repair your board by hand soldering, please keep the conditions of this chapter.
(7) Do not wash this product.
(8) Refer to the recommended pattern when designing a board.
(9) Pressing on parts of the metal cover or fastening objects to the metal will cause damage to the unit. Usage Condition Notes
(1)Take measures to protect the unit against static electricity. If pulses or other transient loads (a large load applied in a short time) are applied to the products, check and evaluate their operation before assembly on the final products.
(2)Do not use dropped products.
(3)Do not touch, damage or soil the pins.
(4) Follow the recommended condition ratings about the power supply applied to thisproduct.
(5)Electrode peeling strength: Do not add pressure of more than 4.9N when soldered on PCB
(6) Pressing on parts of the metal cover or fastening objects to the metal cover will cause damage. 14 ESP32M4/M16/E4/E16 WiFi Modules Draft Ver 0.10 Jan. 2020
(7) These products are intended for general purpose and standard use in general electronic equipment, such as home appliances, office equipment, informationand communication equipment. Storage Notes
(1)The module should not be stressed mechanically during storage.
(2)Do not store these products in the following conditions or the performancecharacteristics of the product, such as RF performance will be adverselyaffected:
Storage in salty air or in an environment with a high concentration of corrosive gas. Storage in direct sunlight Storage in an environment where the temperature may be outside the range specified. Storage of the products for more than one year after the date of delivery storage period.
(3) Keep this product away from water, poisonous gas and corrosive gas.
(4) This product should not be stressed or shocked when transported.
(5) Follow the specification when stacking packed crates (max. 10). Safety Conditions These specifications are intended to preserve the quality assurance of products and individual components. Before use, check and evaluate the operation when mounted on your products. Abide by these specifications, without deviation when using the products. These products may short-circuit. If electrical shocks, smoke, fire, and/or accidents involving human life are anticipated when a short circuit occurs, then provide the following failsafe functions, as a minimum.
(1)Ensure the safety of the whole system by installing a protection circuit and a protection device.
(2)Ensure the safety of the whole system by installing a redundant circuit or anothersystem to prevent a dual fault causing an unsafe status. Other Cautions
(1)This specification sheet is copyrighted. Reproduction of this data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations, and notices.
(2)Do not use the products for other purposes than those listed.
(3)Be sure to provide an appropriate failsafe function on your product to prevent anadditional damage that may be caused by the abnormal function or the failure of the product.
(4)This product has been manufactured without any ozone chemical controlled under the Montreal Protocol.
(5)These products are not intended for other uses, other than under the special conditions shown below. Before using these products under such special conditions, check their performance and 15 ESP32M4/M16/E4/E16 WiFi Modules Draft Ver 0.10 Jan. 2020 reliability under the said special conditions carefully to determine whether or not they can be used in such a manner. In liquid, such as water, salt water, oil, alkali, or organic solvent, or in places where liquid may splash. In direct sunlight, outdoors, or in a dusty environment In an environment where condensation occurs. In an environment with a high concentration of harmful gas.
(6) If an abnormal voltage is applied due to a problem occurring in other componentsor circuits, replace these products with new products because they may not beable to provide normal performance even if their electronic characteristics and appearances appear satisfactory.
(7) When you have any question or uncertainty, contact Fanstel. 16 ESP32M4/M16/E4/E16 WiFi Modules Draft Ver 0.10 Jan. 2020 Packaging and Lot Number Production modules are delivered in reel, 1000 modules in each reel. Lot number for modules made after May 2019, can be used to track silicon version of SoC, module PCB version, and production test code version. FCC LABEL The Original Equipment Manufacturer (OEM) must ensure that the OEM modular transmitter must be labeled with its own FCC ID number. This includes a clearly visible label on the outside of the final product enclosure that displays the contents shown below. If the FCC ID is not visible when the equipment is installed inside another device, then the outside of the device into which the equipment is installed must also display a label referring to the enclosed equipment The end product with this module may subject to perform FCC part 15 unintentional emission test requirement and be properly authorized. This device is intended for OEM integrator only. 17 ESP32M4/M16/E4/E16 WiFi Modules Draft Ver 0.10 Jan. 2020 Revision History January 2020, Ver 0.10: Initial draft release 18 ESP32M4/M16/E4/E16 WiFi Modules Draft Ver 0.10 Jan. 2020 Contact Us United States:
Fanstel Corp. 7466 E. Monte Ctisto Ave. Scottsdale AZ 85260 Tel. 1 480-948-4928 Fax. 1-480-948-5459 Email: module@fanstel.com Website: www.fanstel.com Taiwan:
Fanstel Corp. 10F-10, 79 Xintai Wu Road Xizhu, New Taipei City, Taiwan 22101 79 10 10, 22101 Tel. 886-2-2698-9328 Fax. 886-2-2698-4813 Email: tp@fanstel.com Website: www.fanstel.com China:
Fanstel Technologies Corp. 11 Jiale Street Ping-Dih, Long-Gang, Shen Zhen, GD 518117
() 11 Tel. 86-755-8409-0928 Fax. 86-755-8409-0973 QQ. 3076221086 Email: sz@fanstel.com Website: www.fanstel.com 19 ESP32M4/M16/E4/E16 WiFi Modules Draft Ver 0.10 Jan. 2020 Federal Communications Commission (FCC) Statement You are cautioned that changes or modifications not expressly approved by the part responsible for compliance could void the users authority to operate the equipment. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
-Reorient or relocate the receiving antenna.
-Increase the separation between the equipment and receiver.
-Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
-Consult the dealer or an experienced radio/TV technician for help. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
1) this device may not cause harmful interference, and 2) this device must accept any interference received, including interference that may cause undesired operation of the device. FCC RF Radiation Exposure Statement:
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. End users must follow the specific operating instructions for satisfying RF exposure compliance. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter. RF exposure warning This equipment must be installed and operated in accordance with provided instructions and the antenna(s) usedfor this transmitter must be installed to provide a separation distance of at least 20 cm from all persons and mustnot be co-located or operating in conjunction with any other antenna or transmitter. End-users and installers mustbe provide with antenna installation instructions and transmitter operating conditions for satisfying RF exposurecompliance. Industry Canada (IC) Statement This device complies with Industry Canada licence-exempt RSS standard(s). Operation is subjectto the following two conditions: (1) this device may not cause interference, and (2) this devicemust accept any interference, including interference that may cause undesired operation of the device. 20 ESP32M4/M16/E4/E16 WiFi Modules Draft Ver 0.10 Jan. 2020 Canada, avis dIndustry Canada (IC) Le prsent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est autorise aux deux conditions suivantes:
(1) l'appareil ne doit pas produire de brouillage, et
(2) l'utilisateur de l'appareil doit accepter tout brouillage radiolectrique subi, mme si le brouillage est susceptible d'en compromettre le fonctionnement. Informations concernant l'exposition aux frquences radio (RF) Cet quipement est conforme avec l'exposition aux radiations IC dfinies pour un environnement noncontrl. Cet quipement doit tre install et utilis une distance minimum de 20 cm entre le radiateuret votre corps. Cet metteur ne doit pas tre co-localises ou oprant en conjonction avec une autreantenne ou transmetteur. Les utilisateurs finaux et les installateurs doivent tre informs des instructions d'installation de l'antenne et des conditions de fonctionnement de l'metteur afin de satisfaire la conformit d'exposition RF. Note: The end product shall has the words Contains Transmitter Module FCC ID:X8WESP32M16, IC: 4100A-ESP32M16 Information for the OEM and Integrators The following statement must be included with all versions of this document supplied to an OEM or integrator, but should not be distributed to the end user.
(1) This device is intended for OEM integrators only.
(2) Please see the full Grant of Equipment document for other restrictions. 21 ESP32M4/M16/E4/E16 WiFi Modules Draft Ver 0.10 Jan. 2020 This radio transmitter IC: 4100A-ESP32M16 has been approved by Innovation, Science and Economic Development Canada to operate with the antenna types listed below, with the maximum permissible gain indicated. Antenna types not included in this list that have a gain greater than the maximum gain indicated for any type listed are strictly prohibited for use with this device. Cet metteur radio IC: 4100A-ESP32M16 a t approuv par Innovation, Sciences et Dveloppement conomique Canada fonctionnera avec les types d'antennes numrs ci-dessous, avec le gain maximal admissible indiqu. Les types d'antennes non inclus dans cette liste qui ont un gain suprieur au gain maximum indiqu pour tout type rpertori sont strictement interdit pour une utilisation PCB Antenna ESP32M: 2.22 dBi; 50.0 ohms ESP32F: 1.70 dBi; 50.0 ohms Dipole Antenna ESP32E: 0dBi; 50.0 ohms avec cet appareil. PCB Antenna ESP32M: 2.22 dBi; 50.0 ohms ESP32F: 1.70 dBi; 50.0 ohms Dipole Antenna ESP32E: 0dBi; 50.0 ohms 22