guides:wvars_project
Table of Contents
Welland Valley Amateur Radio Society Project
Introduction
- A winter project for WVARS group, PCB designed by Tim, based on the original stripboard design.
Components
| QTY | Description | Where to find | Cost (Estimated) |
|---|---|---|---|
| 1 | Main PCB | Supplied by Colin | FOC |
| 1 | RFM69HW Transceiver 868MHz | Link to eBay seller | £1.73p |
| 1 | MPL3115A2 Barometric Pressure/Altitude/Temperature Sensor | Link to eBay seller | £3.44p |
| 1 | 28 pin IC Socket | Link to eBay seller | |
| 1 | ATMEGA328PU | Supplied by James 7 available | FOC |
| 1 | MCP1700-3302E Voltage Regulator TO92 | Link to eBay seller | £2.47p |
| 1 | LED | Junk Box | FOC |
| 1 | SMA PCB connector | Link to eBay seller | £2.30p |
| 2 | Ceramic Cap “104” = 0.1 uF | Junk Box | FOC |
| 2 | 35v Cap “105” = 1.0uF | Junk Box | FOC |
| 3 | 0.25w 10k carbon resistor | Junk Box | FOC |
| 1 | 0.25w 39k carbon resistor | Junk Box | FOC |
| 1 | 0.25w 1.5k carbon resistor | Junk Box | FOC |
Installation
Burn Bootloader
- Insert the following code into boards.txt, this is usually in your Arduino directory in hardware/avr/
############################################################## atmega328bb.name=ATmega328 on a breadboard (8 MHz internal clock) atmega328bb.upload.tool=avrdude atmega328bb.upload.protocol=arduino #atmega328bb.upload.protocol=stk500 atmega328bb.upload.maximum_size=30720 atmega328bb.upload.maximum_data_size=2048 atmega328bb.upload.speed=57600 atmega328bb.bootloader.tool=avrdude atmega328bb.bootloader.low_fuses=0xE2 atmega328bb.bootloader.high_fuses=0xDA atmega328bb.bootloader.extended_fuses=0x05 atmega328bb.bootloader.path=arduino:atmega atmega328bb.bootloader.file=atmega/ATmegaBOOT_168_atmega328_pro_8MHz.hex atmega328bb.bootloader.unlock_bits=0x3F atmega328bb.bootloader.lock_bits=0x0F atmega328bb.build.mcu=atmega328p atmega328bb.build.f_cpu=8000000L atmega328bb.build.core=arduino:arduino atmega328bb.build.variant=arduino:standard
- Insert your ATMega328 into an Arduino board (e.g. UNO) and using a AVR Programmer such as AVRISP mkII burn the arduino bootloader onto the ATMEGA328 chip
Flashing the code
- Move the chip back to the WVARS PCB
- Using a USB serial convertor chip (either a FTDI or even the one built into the UNO) you can then upload code to Arduino chip. (Connect Rx and Tx as well as VCC and GND)
Install the WVAR code
- First install the MPL3115A2 Adafruit Library
- Go to Sketch → Include Library → Manage Libraries
- Search for MPL3115A2 and install the Adafruit library