A low-cost nrf52 device with the form-factor of the heltec v2 & v3 devices compatible with Meshtastic®.
- Small form, based on Heltec v3: You can use the same cases!
- i2c side ports ready to connect an OLED SSD1306 screen.
- Battery sensing: You can use SMD resistors or through-hole.
- 2mm mounting holes.
- Compatible with HT-RA62 / Ra-01SH LoRa modules (and probably others with similar footprint).
- The variant & design is based on the DIY proMicro variant.
- As MCU board its used ProMicro/SuperMini
(aka firmware files)
| Version | Lora Modules | Official Repo link | Unofficial Repo link |
|---|---|---|---|
| With TXCO | EByte E22/E220-xxxM-22S/HT-RA62 | Official repo - With TXCO | With TXCO @mrekin/MeshtasticCustomBoards |
| Without TXCO | EByte E22/E220-xxxMM-22S/RA-01SH | Official repo - Without TXCO | Without TXCO @mrekin/MeshtasticCustomBoards |
You can use mrekin's flasher
| Part | Source | Cost (€) | Note |
|---|---|---|---|
| ProMicro (aka NiceNano) | Aliexpress | 6€ | |
| HT-RA62 | AliExpress | 5€ | You can use Ra-01SH as well Ra-01SH |
| 2x Through Hole Resistors // SMD resistor | Aliexpress | 3€ pack 0.1€/resistor |
You can buy a package of multiple values for a few €. Choose depending on material you already have &/or soldering skills. I'm using 2x 1M ohms |
| OLED SSD1306 i2c (optional) | AliExpress | 1.5€ | No need to solder, just be careful and add some tape on one of the boards to avoid a shortcut. |
| Battery connection (optional) | AliExpress | 2€ pack 0.4€/unit |
This is an example. |
| Antenna pigtail (recommended) | AliExpress | 2€ | I saw that it underperformed whith a cheap black pigtail, after using one of these, it worked fine. |
| PCB | 2€ pack of 5 0.4€/unit |
Use your favourite company to get the pcb. | |
| Total | 11,9€ |
Check if the bootloader version is >0.8, update if needed from here
Look for: "update-nice_nano_bootloader-X.X.X_nosd" where X.X.X is the version. Latest version is: update-nice_nano_bootloader-0.9.1_nosd.uf2
To flash all you need to do is to connect the device via USB and double tap reset, by double tap RST and GND pins with tweezers. After doing so you should see in your OS a USB storage device named "NICENANO". Copy/move the .uf2 file into the storage device and wait for the reboot.
If you plan to charge the batteries, remember you can increase the charging current by bridging the boost pads at the bottom of the proMicro board. You'll find more info on Aliexpress listing, and also here.
Thanks to all the folks in the Discoord NRF52 chat for the support on designing this board ♥
| Front | Back |
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Meshtastic® is a registered trademark of Meshtastic LLC. Meshtastic software components are released under various licenses, see github for details.
No warranty is provided. You do and use it at your own risk and take the responsibility upon yourself.