Pi Setup

Prepare the SD Card. I am going to use the latest being Buster desktop only. Download from raspberrypi.org verify and write to the SD card; // Verify the download #shasum -a 256 ~/Downloads/2020-08-20-raspios-buster-armhf.zip 9d658abe6d97f86320e5a0288df17e6fcdd8776311cc320899719aa805106c52  /Users/allen/Downloads/2020-08-20-raspios-buster-armhf.zip // Verify the SD card; #diskutil list // Unmount it; #diskutil unmountDisk /dev/disk3 // copy the image across; #sudo dd bs=1m if=~/Downloads/2020-08-20-raspios-buster-armhf-lite.img of=/dev/disk3 Setup the SD card […]

ISS Monitor

Announced September 2020, the ISS has activated a 437.800 MHz cross band FM repeater. Using a uplink frequency of 145.990 MHz with an access tone [CTCSS] of 67 Hz and a downlink frequency of 437.800 MHz. This is worth trying so need to know when the ISS was going overhead. Searching for prediction software and come across the Open Notify API which […]

Web DB Server

A Linux LAMP server on a ARM processor (64bit Quad Core @ 1.2GHz) in a Raspberry Pi 3. The stack in this case consists of; Linux-raspi2 (5.3.0-1027-raspi2)(Ubuntu 18.04)Apache/2.4.29 10.1.44-MariaDBPHP 7.2 PHP is used to store then display the data. Apache for the heavy lifting. API The REST API is in a simple single PHP file. This is the interface to interact […]


Ended up with two gateway devices. This was due to the devices occasionally hanging. A lot of time and debug code was used chasing why they were misbehaving. They just seam to go deaf. The main loop would check if a packet was available then process, …….// else try to parse packetint packetSize = LoRa.parsePacket();if (packetSize) {sendLoRaReceived(packetSize);} so with debug […]

Lora Sensors – Hardware

What have I been doing during the coronavirus lockdown, well playing with microcontrollers, This is a continuation of the experiments with Lora devices and have concentrated on developing nodes for measuring basic conditions inside and extended conditions outside. I have ended up with; ASR6501 based internal devices X 2 ESP32 based external Weather station ESP32 based Lora gateway Raspberry Pi 3 […]

Lora Sensors

Sensor Network Have been looking at deploying a sensor network for a while now. Live on land here. My desire is to deploy basic sensors around the block reporting conditions (temp, humidity..) and also to activate relays (water system) or actuators (chicken house door). They will need to be watertight and low power. This is not a surveillance network. Its a […]

Arduino Sensors – Sender

Arduino Sensors – Test Sender This is the code for the test devices based on Arduino UNO. The Duemilanove has hard coded values while the UNO a sensor. This is the code for 1 (Duemilanove with no sensors).  As the sensors come in will be adding to the sketch and simply un commenting the required calls for the target device. […]

QRPLabs QCX 5W CW single band transceiver

QRPLabs QCX 5W CW Single band transceiver Another Arduino basd project, well not quite. The Arduino Uno is a microcontroller board based on the ATmega328P. This kit from QRPLabs also uses the ATmega328P. The software is not open source. Updates are provided as hex files. This kit is extremely well documented. It is worth buying and assembling just for the documentation. The […]

W8TEE and K2ZIA Antenna Analyzer

Another Arduino based project. This time an W8TEE and K2ZIA Antenna Analyzer. Purchased the PCB from https://qrpguys.com/w8tee-k2zia-antenna-analyzer Not a kit so sourced the components. Easy to order from china off eBay. Took about 2 weeks for all the bits to come in. Assembled and she started but the SWR for a 51ohm dummy load was off the scale. The audrino and screen […]


HF SIGNALS started shipping the μBITX boards (or micro BITX) December 2017. This is a a fully wide-band 3 to 30 MHz transceiver with upper and lower sideband and CW, power up to 10 watts and solid digital control. The circuit boards come wired and tested and with all the hardware. An interesting component of this radio is the Radino. This board has […]