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guides:wvars_project

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 SketchInclude LibraryManage Libraries
    • Search for MPL3115A2 and install the Adafruit library
guides/wvars_project.txt · Last modified: 2020/07/08 05:30 by jcoxon