Experiments Archives – Class B Project

grbl homing using NC switches

grbl homing with NC switches can start out as something small but can become very tricky very fast. There are plenty of options within the firmware but getting a combination of settings right is critical. However with the correct wiring and right sequence of options in grbl can lead to flawless homing within minutes.

Mini UPS based on TI’s BQ24650

This is a mini UPS based on TI’s BQ24650 Li-Ion battery charger and Liner’s LTC4353 load switch. The BQ24650 is essentially a multi-chemistry battery charger specifically meant for solar panels. It can charge upto 4 Li-Ion batteries. Other chemistries are…

A mini battery backup based on Linear’s LT3652HV & LTC4353

This is a mini UPS battery backup based on Linear Technology’s LT3652HV. The HV is a high voltage version that can charge upto 4 cell Li-Ion batteries. Other chemistries are also supported. This one supports charging using a solar panel…

Interfacing a touch keypad with an AVR

I’ve always admired touchpad technology and I recently got a chance to make my own 12-key touchpad using Freescale’s MPR121Q. This nifty little chip supports upto 12 debounced pads, configurable registers and works on the I2C protocol. All the electrodes…