A Minimal LoRa Sensor Node using an Atmel ATTiny84 and a HopeRF RFM95W LoRa Module (Versions 1 and 2)
https://www.attno.de/
| Case | ||
| Firmware | ||
| PCB_SMD | ||
| PCB_THT | ||
| case_back.jpg | ||
| case_front.jpg | ||
| case_side.jpg | ||
| pcb_back.jpg | ||
| pcb_front.jpg | ||
| README.md | ||
TinyLoRa Sensor Node
Overview
A Minimalistic Sensor Node for use on TheThingsNetwork.
Features
- Small Size, only 47x36x15mm populated (SMD Version)
- Based on widely available Atmel ATTiny84 MCU and RFM95W LoRa-module
- 6 free GPIO-Pins from the ATTiny + Power to connect sensors on a 2.54mm pitch header
- Optional on-board LED for status signaling (SMD Version)
- Powered by a single CR2032 lithium battery
- Long battery runtime using the ATTinys deep sleep mode
- Integrated 6-Pin programming header (SMD Version)
- Small component count
Subdirectories In this Repository
- Case: A 3D-Printable Case, OpenSCAD and STL Files
- Firmware: Example Firmware, platformio project
- PCB_SMD: PCB for SMD components, KiCAD project
- PCB_THT: PCB with through-hole components, KiCAD project, Currently not all Features of the SMD Version
Pinouts
PRG1 Starting from Marked Top Left Pin
| MISO | 3V3 |
| SCK | MOSI |
| RST | GND |
J1 Starting from Marked Pin 1
| Number | Function | Note |
|---|---|---|
| 1 | 3V3 | Directly connected to Battery |
| 2 | GND | Directly connected to Battery |
| 3 | ATTiny84 PA0 | i2C SCL in Example Firmware |
| 4 | ATTiny84 PA1 | i2C SDA in Example Firmware |
| 5 | ATTiny84 PA2 | |
| 6 | ATTiny84 PA3 | |
| 7 | ATTiny84 PA7 | Connected to LED-Pad D1 via R1 |
| 8 | ATTiny84 PB2 |
Thanks & Acknowledgements:
- The TinyTX Project, which served as an inspiration
- Everyone making The Things Network happen
- Some ideas where taken from the c't magazines "Brief-Fernmelder" Project