MyESP32 Bridge is a fun, rechargeable and versatile board for Mysensors and your home automation.

This is a work in progress project.

The board

A year ago, i designed a fun project. This was a rechargeable gesture mote with RGB led ring ATSAM mcu based. But when ESP32 has been announced, I secretly waited for its release.. I also wanted to improve a bit the concept, and cost by more modularity.

Finally, I am happy to show you MyESP32 Bridge, not really fancy name though :)

For those who don't know yet about ESP32, I'm using ESP32-WROOM which is

• FCC, CE, IC, MIC, KCC, NCC certified module
• Xtensa dual-core, 32-bit LX6 processor. One core for radio, one core for application firmware
• Wi-Fi: 802.11b/g/n/e/i
• Bluetooth: v4.2 BR/EDR and BLE
• 12-bit SAR ADC up to 18 channels
• 2 x 8-bit DACs
• 10 x touch sensors
• Temperature sensor
• 4 x SPI (but one is used by internal flash memory)
• 2 x I2S
• 2 x I2C
• 3 x UART
• 1 SD/SDIO/MMC host
• 1 slave (SDIO/SPI)
• Ethernet MAC interface with dedicated DMA and IEEE 1588 support
• CAN bus 2.0
• IR (TX/RX)
• Motor PWM
• Built in remote peripheral up to eight channels
• Hall effect sensor
• "low power"
• Security features IEEE 802.11, including WFA, WPA/WPA2 and WAPI
• Secure boot
• Flash encryption
• Cryptographic hardware acceleration: AES, SHA-2, RSA, ECC, random number generator (RNG)

So what is my board capable of ?

• Serial Gateway,
• Wifi Gateway,
• Bluetooth/BLE Gateway,
• CAN bus Gateway,
• Sniffer with visual feedback,
• IR blaster,
• rechargeable for example for backup power
• can use extension board with MYSX connector, so a development board too
• and so on, i'm sure i'm missing usecases :)

More detailed specifications:

• Wifi or Bluetooth/BLE thanks to ESP32 mcu
• NRF24 footprint
• RFM69/95 footprint
• NRF24 and RFMs radio can be used at same time, each one on their distinct SPI Bus, or on same SPI Bus (configurable via smd jumpers)
• CAN bus with voltage source selection (3.3 or 5v)
• **Onboard IR emitter and receiver **
• IR emitter pinheader for a blaster extension (just needs the diodes, circuit is onboard)
• USB interface with onboard CP2104 for programming and serial stuff
• 2x onboards RGB Leds
• and 2x right angle tactile switches : Reset and User button
• Pinheader for connecting a cheap RGB led ring from aliexpress (12x leds version), saving costs of rgb leds assembly.
• Cutoff for RGB leds circuit by load switch
• Lipo rechargeable (decided to use LIPO instead of LifePO4 because of RGB leds voltage levels during battery lifetime) with JST connector
• Battery voltage sensing
• Step down converter with filtering for 3.3v
• ESD and load protection for USB
• Auto switch between USB and battery if usb is disconnected for example
• JTAG lines pinheader
• for quick compatibility with Mysensors, and as ESP32 arduino core is in dev, i have added an I2C EEprom for routing table etc, and ATSHA204A for signing
• 3x holes for holding the board in enclosure
• 4x holes for holding the aliexpress 12x RGB leds ring

Known issues

TODO

• Upload files, be patient please :)
• etc.

Contributors

Special thanks to

• tekka from Mysensors Core Team, for feedbacks and motivating me
• Mysensors Core Team :)
• Adafruit, Sparkfun, TI, Atmel, ESP32 forum etc.. for all educational infos they share

Links, reference and license

• Copyright Scalz (2017). released under the CERN Open Hardware Licence v1.2