This is an adapter board to connect an IMST iC880A-SPI LoRaWAN concentrator board to a 40-pin Raspberry Pi (2B / 3B / Zero). It also gives you some ways to enhance and monitor your gateway. Current version: v2.0 (see news post for details). Raspberry Pi not included!
Note: This board is sold as a development kit and not a finished product. It is hand-soldered with leaded solder and is not ROHS compliant. No certifications have been done, but every assembled board is tested by us before shipping, to ensure it works!
Besides connecting the two boards, the PCB gives you the following additional features:
- Screw terminal for direct power input/output (5V)
- Screw terminal with on-board MP1584 step-down regulator (6.7-28V input, fixed 5V output). Great to connect a PoE-Adapter.
- Polyfuse and TVS diode to protect against voltage spikes
- Protection against accidentally reversed polarity
- Full access to Raspberry Pi GPIO header
- Pin header for serial communication (RX/TX)
- 2 pin headers with pull-ups for I²C based sensors (SDA/SCL/GND/3.3V/5V)
- Mounting holes for Raspberry Pi 2B / 3B / Zero
- Programmable button connected to GPIO (e.g. to shut down the Pi)
- Three programmable LEDs (Red/Yellow/Blue) connected to GPIO header
- MOSFET with flyback diode for connecting and regulating a 5V DC fan
- Open source hardware, full schematics provided!
Two nylon spacers are included. For the basic version all SMD parts are soldered, through hole parts (pin headers, screw terminals) are not soldered.
Optional: With Sensors (+10 CHF)
- Sensirion SHTC3 temperature / humidity sensor made in Switzerland (accuracy: ±2%RH, ±0.2°C)
- Microchip MCP3425 16-bit ADC to monitor input voltage
Optional: Fully Assembled (+20 CHF)
- All boards come with the SMD parts already soldered, but with this option we’ll also solder all the pin headers and screw terminals.
More details can be found here: https://github.com/dbrgn/ic880a-backplane
Note: In most cases, PCBs with sensors have red soldermask, and PCBs without sensors have blue soldermask. In case we run out of PCBs of the “right” color, we may als use the other color though.
- You can find the schematics here.
- Here is a quick guide on how to read a temperature/humidity sensor from the Raspberry Pi. The guide is for the SHT21, but you can simply load the “shtc1” kernel module instead of “sht21”, the rest should work the same.
- To monitor your gateway, you can find Collectd plugins for the SHTC3 and the MCP3425 here.
- The LEDs are connected to GPIO pins 36, 38 and 40 (BOARD numbering system). The button is connected to GPIO pin 32 (BOARD numbering system). You can find an example script here.
- In case you want to use the MCP3425 ADC to monitor the supply voltage: Here is an example script. You can find a Collectd plugin on Github. And here’s a brand new Rust driver.
- Here is an example shutdown script (and sytemd service file) that allows you to shut down your Pi with the button.
We offer both untracked (non-insured) economy shipping and tracked (insured) priority shipping. We ship with Swiss Post only. All shipments are carbon neutral. For information on expected delivery times, see their document on carriage times. Note that sometimes processing at customs can cause additional delays (and possibly costs, depending on your country).
Note: Due to the thickness of an assembled board (>2cm), the shipping costs for fully assembled boards are higher than for the non fully assembled versions. You can calculate the shipping cost in the shopping cart.
Feel free to contact us at email@example.com if you have any questions or any general feedback. We’re also happy about reviews, just click on the “Reviews” tab above!
Thanks for your order! With it, you are supporting the efforts of our hackerspace to provide the infrastructure for noncommercial technical projects and to teach electronics and programming to kids and other people that want to learn 🙂