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A new Dual Antenna ESP32 Module: The WROOM-DA (Patreon)

Published:
2022-04-01 06:48:51
Imported:
2026-06
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Content

Do you think: This is an April fools’ day hoax? No, it is not. Instead, it is the ugliest ESP32 I ever saw. It looks like a T-shirt. So what is it, and how is it useful? Let’s have a closer look.

https://youtu.be/F0u5qIwwY1k

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A new Dual Antenna ESP32 Module: The WROOM-DA

Do you think: This is an April fools’ day hoax? No, it is not. Instead, it is the ugliest ESP32 I ever saw. It looks like a T-shirt. So what is it, and how is it useful? Let’s have a closer look. My second channel: https://www.youtube.com/channel/UCQwyP4Yd0-O49e05kMUJgQQ Links: Breadboard-friendly board: https://s.click.aliexpress.com/e/_AbwhCD Prototyping board: https://s.click.aliexpress.com/e/_ANOABj PCB for ESP32: https://s.click.aliexpress.com/e/_AV6LA9 ESP32-S3 Board: https://s.click.aliexpress.com/e/_AtA4Y9 Mouser: https://bit.ly/3Lw6GRB Datasheet: https://www.espressif.com/sites/default/files/documentation/esp32-wroom-da_datasheet_en.pdf Documentation: https://docs.espressif.com/projects/arduino-esp32/en/latest/api/wifi.html FCC info WROOM-DA: https://fcc.report/FCC-ID/2AC7Z-ESPWROOMDA/ Development release link: https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_dev_index.json The links above usually are affiliate links that support the channel (no additional cost for you). Supporting Material and Blog Page: http://www.sensorsiot.org Github: https://www.github.com/sensorsiot My Patreon Page: https://www.patreon.com/AndreasSpiess Discord: https://discord.gg/JfgDSa8 If you want to support the channel, please use the links below to start your shopping. No additional charges for you, but I get a commission on your purchases to buy new stuff for the channel My Amazon.com shop: https://www.amazon.com/shop/andreasspiess For Banggood https://bit.ly/2jAQEf4 For AliExpress: http://bit.ly/2B0yTLL For Amazon.de: http://amzn.to/2r0ZCYI For Amazon UK: http://amzn.to/2mxBaJf For ebay.com: http://ebay.to/2DuYXBp https://www.facebook.com/profile.php?id=100013947273409 https://twitter.com/spiessa https://www.instructables.com/member/Andreas%20Spiess/ Please do not try to email me. This communication channel is reserved for my primary job As an Amazon Associate, I earn from qualifying purchases #no#midroll#ads

Comments

Craig Larson

Andreas, thanks as usual. The two planar antennae you implement are in flat to the X-Y plane. Does the Z- axis matter? I noticed that the orientation, in your test, were oriented in the X-Y plane. I have several 433 MHz antennae ( straight 17.2 cm) projects and I always try to mount them pointing parallel to the Z-vector (up or down). I have had good luck with ESP8266 PCB antennae when mounting them facing flat towards my router (again Z-vector). Perhaps I am 90 degrees off and could do much better?

Anonymous

Hi Andreas, I am often facing problems when using Wi-Fi and Bluetooth together. Do you think it is possible to use one antenna for Wi-Fi and the other one for Bluetooth? Would that help?

AndreasSpiess
>>81085734

Yes, the z-axis matters. In two ways: 1. Polarization. All signals are polarized. In one nearfield more than in the far-field where most signals are also reflected. If the polarization is not the same between the signal and the antenna we have losses. This is why satellites often use circular polarization, BTW 2. The "Gain" pattern shown in the videos is also different in the different axes. All these effects are superimposed. So only a test can show reality. I could have turned the antenna 90 degrees and would have gotten different results. There is even a third effect: Because the wavelength is only 13 cm the signal strength can vary considerably if you move the antenna by a few cm. This effect is called "space diversity" It is always good advice to turn the antenna in different directions as well as move it slightly around and place it where you get the best signal. But for these short wavelengths and indoors things constantly change. If the two antennas are regularly switched to the stronger signal, they can profit from this situation

AndreasSpiess
>>81089734

The ESP32 only has one radio. So it always either uses Bluetooth or Wi-Fi. Two antennas would not make sense. If you use two ESPs then you could use one for WiFi and the other for Bluetooth. But I am not sure if it would help. The two signals would no longer be synchronized and could disturb each other. Even if they do not use the same channel