An advanced lithium battery charger and powerbank with a SSD1306 OLED display based on the BQ25896 IC and ATMEGA32U4 MCU. I wanted to make a battery charger that was not based on the popular Chinese TP4056 IC that you see all over the internet. So after some research I came across the Texas Instruments BQ25896, this is a single cell 3A charger that can be controlled using I2C, it also has a boost mode and can turn the connected battery into a powerbank delivering up to 2A of current. This charger IC is typically used in mobiles and I did not hand solder it, all the other standard SMD components were hand soldered.
Arduino Nano 33 IoT Modular Nixie Clock with Web UI USB 5V or 12V, Motion, Light, Temperature, Humidity & Pressure Sensors. NTP Sync, Web Interface for changing settings/time & wifi. Project description The story *** Caution the PSU can output high DC voltages, can cause serious injury *** I'm a bit late to the Nixie Party but I finally made it here. This Nixie Clock is a bit different from the others; it runs using an Arduino Nano 33 IoT, has a motion sensor, light sensor, temperature, humidity & barometric pressure sensor and runs from 5V USB or 12V. It has a web interface for changing settings and syncs the time using NTP. Before I got to the final product, I had spent a lot of time making a Shift Register version with transistors and multiplexing, this worked on the breadboard however I got severe ghosting when I made the PCBs. I gave up and switched over to the HV5530 IC which simplifies things. I had to devour a box of Mr Kipling cakes quickly so I could build the