I’m in the preliminary stages of making some new hardware to run Meshtastic on just for fun. T-Beams are great bang for buck but aren’t exactly tailor made for this application.
This is what I have so far but I would like your opinion on features or hardware you think would be ideal.
At this stage it will basically be an interface board between the various modules with some basic circuity for low level functions.
- ESP32-WROVER-B Module - 4MB Flash, 8MB PSRAM, TP4054 charger, CP2104 Serial
- LoRa - EByte E22-XXX30S - 1W LoRa module with IPEX connector (provides 23db increase of link budget over T-Beam HPD13A).
- Antenna - External SMA connector.
- Screen - 128x64 SSD1306 1.3" OLED.
- Buttons - L, R, U, OK.
- GPS - BEITIAN BS414Q with QMC5883L Compass.
- Batteries - 2x 18650 holder (potentially 7000mAh), reverse polarity protection with warning LED’s.
- Size - Approximately 90L x 40W x 30H
I’m hoping once I have some hardware built up that I will be able to make changes to the code to get the basics up and running but I’m thinking I’ll need a bit of help with the deeper level stuff. Especially the handling of the SX1262 in the E22 module. Buttons and compass are just additional extras over the T-Beam I thought might be handy in the future.
I’m especially keen to see how the E22 1W modules perform (30dBm TX, -150dBm RX, T-Beam 20dBm TX, -139.5dBm RX) although they may not be full 1W as I will be running off 1 cell battery voltage not the ideal 5V the datasheet recommends (voltage range is 2.5-5.5V though).
This would be a portable, fully functioned node. I envisage people would like a “headless” node (phone control only, smaller form factor) and maybe a base station node (solar, more LoRa modules, directional antennas).
Depending how the trial goes I would definitely be open to facilitating a group buy or the like of all the bits we need and get a few out there!
Let me know your thoughts.