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PCB Repair Using Silver Glue and Solder Mask
A short review/demonstration about using silver glue and UV-curable solder mask to repair damages to a PCB. The PCB in question (see above) has a hole through the first layer — with the bottom layer traces shoving —…
Read More »Creating a Raspberry Pi Computer Cluster – All the Things That Can Go Wrong
A computer cluster is a set of computers that share a common workload in order to speed up the processing. The idea is to split the work into separate parts that can be processed at the same time…
Read More »Fridge Door Alarm + Weather Forecast
This handy gadget serves as both a fridge door alarm — make a noise when the door is open for too long — and as a weather forecaster. The first part is simple, using reed switches to monitor…
Read More »Automatic Watering System
An automatic watering system with 2 modes: water every day/every 2 days/once a week OR water once the soil gets dry enough. Parts: Arduino Nano Analog capacitive moisture sensor 1.2 2 x 5K Ohm rotary potentiometers (with knobs)…
Read More »Low-Power RTC Module
As a part of an off-grid project I’m working on with, I need a low-power real-time clock (RTC) to periodically wake up my main circuit. I started working with a Z2-042 DS3231 RTC module (about 1 € from ebay),…
Read More »Improved Randomization for the Party Button
After awhile in use, a problem came up with the Party Button: some song were being played much more often than others. One time, a song was played 4 times in a row, which was quite unsatisfying. Obviously,…
Read More »Cooling Raspberry Pi with a Fan
Continuing with my quest to cool down the Raspberry Pi 3, I purchased a small 3 x 3 cm fan (model ASB0305MA, 5 V DC). I could have just plugged it directly into the Pi’s 5 V output…
Read More »The Party Button – DIY Music Box
There’s a box with a button on the table. You press it, and suddenly there’s loud music, colorful lights flashing, and obviously a wild party going on everywhere. Well… almost. In this case, there’s one light blinking merrily…
Read More »Cooling Raspberry Pi 3 with Heat Sinks
Recently I had to come up with something costing about 3 € to get the free shipping from Amazon, so I added a Raspberry Pi heat sink set from Az-Delivery to my shopping basket. I have a Raspberry Pi…
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