One of my long-waiting outstanding projects is to fix this no-frill SoundTech doorbell. I finally done it, by replacing the RF transmitter/receiver used by the doorbell with ESP-NOW. Continue reading "Fix a Wireless Doorbell with ESP-NOW"
This is just another weekend project. I need a temperature and humidity monitor, instead of buying one from Ikea, I decided to make one with a Sensirion SHT40 sensor and a ATtiny824 MCU.
Continue reading "Build a SHT40-based temperature and humidity monitor"
A while back when browsing Aliexpress, I saw this 4-digit segment LCD glass that selling for slightly more than USD1.00, so I bought it out of curiosity and this article describes on how to drive the LCD glass with GPIO, no dedicated LCD controller used.
Continue reading "How to drive a segment LCD glass with GPIO"
Hackaday.io is having a 2024 Business Card Contest between May and July 2024, I decided to enter the contest with my own design. This describes my design process from planning to the completion for a business card that can be used as real time clock with 3-year battery life and can also be used as an ATtiny3227 development board. Continue reading "ATtiny3227 Business Card + Clock + Development Board"
I had a classic Ikea clock that damaged by the leaking battery, during the new year cleaning, my family decided to throw it away, I took it back from trash bin and thinking of a weekend tinkering project to turn it into a digital clock. Continue reading "ESP8266 NTP clock and Charlieplexing"
This article talks about how I hack a UYue 946 preheater and convert it into a solder reflow hot-plate. Continue reading "Converting UYue Preheater into a Solder Reflow Hot-plate"