Other Electronics

Archived from radmon.org - originally posted 25/02/2023 A cheap and easy way to change a blue LCD or OLED display to yellow/amber using Kapton tape. I don't like blue displays. I never have done. I have always found them to be harsh on the eyes, especially in dark environments. I also find them more difficult to read than green or yellow displays. Blue is a colour that is rarely found in nature. It really was a colour that was/is quite unnatural to the eyes until recent times. It reduces melatonin release into the body and can affect sleep. I discovered some years back that Kapton tape can

Archived from radmon.org - originally posted 12/12/2022 ** Note: This is for submission of CPM readings to radmon.org. This was working at the time of writing but updates to libraries may cause issues. Here is some Arduino code for the Arduino Uno, Mega2560 and Pro Mini with WizNet W5100 ethernet shield. This is bare-bones code only. It does only these things: receives pulses on pin 2 (Uno, Mega & Pro Mini), calculates CPM and submits it to Radmon.org (via ethernet shield) every 60 seconds. It has a little debugging that can print to serial and I have also added CPM print to serial (much

Archived from radmon.org - originally posted 20/02/2022 ** Note: This is for submission of CPM readings to radmon.org. Here is some Arduino code for the ESP8266 written and tested on a Wemos D1 Mini. This is bare-bones code only. It does only these things: receives pulses on GPIO 13 (physical pin D7 on Wemos D1 Mini), calculates CPM and submits it to Radmon.org (via WiFi) every 60 seconds. It has a little debugging that can print to serial, flashes the internal LED when an interrupt event is detected and I have also added CPM print to serial (much like the NetIO GC-10) that can be used with

Archived from radmon.org - originally posted 16/02/2022 I was repairing an old Russian DP-5V counter yesterday and noticed an unusual neon/orange flashing glow coming from the probe PCB that I have never seen before, so decided to investigate. It is caused by two thyratrons on the board, flashing away with the clicks of the counter. They are similar to modern thyristors in their function. These thyratrons are filled with neon gas, hence their orange glow. This is from wikipedia: https://en.wikipedia.org/wiki/Thyratron Conductivity of a thyratron remains low as long as the control grid is

Archived from radmon.org - originally posted 20/12/2021 [Updated: 22/12/2021] Its the first day of holidays and I'm bored already.... So I cooked up a neat wifi/wemos d1 mini/arduino/LED display for displaying a station's current CPM. It works by simply connecting to one's Wi-Fi and then goes to the URL, pulls the data, strips the first space and everything afterwards then converts what is left to a float (the CPM count from the start of the string) and displays it. The bar graph LEDs are mapped from 0 to 100 CPM at full scale deflection, but the 7 segment display will display up to 999.9

Archived from radmon.org - originally posted 06/12/2021 I have bought a 'PBI Microbial Air Sampler SAS Super 90' just for the simple fact it looked proper funky! I have no idea if it works, or how it works, or even exactly what it does, but bought it for shits and giggles. I paid £15. Working, they are going for about £1000! I care not for testing microbes in the air, so I figure I can make something with it. So far I have thought I can turn it into a ridiculously powerful flash light. Something around 100w LED. I could use a liquid cooler in the body, LED and smallish heatsink at the end,

Archived from radmon.org + more - originally posted 18/09/2017 I've been working on an air quality monitor over the weekend. I have a working model that samples and logs every 5 minutes into various .csv files that are used for drawing graphs. It is a work in progress, still much to do. Take a look here: https://www.schmoozie.co.uk/airquality/ Please ignore the data as it is not accurate as is just for testing purposes at the moment. I'll be dumping the collected data and starting from scratch when I get this into an enclosure and mounted properly outside. (All data shown on the page is