Cost-Effective Spin Coater
A benchtop spin coater with closed-loop speed and acceleration control, built from catalogue parts for about ₹3,000.
Arduino · Embedded C · PID control · Gain scheduling
Work
Things that exist physically.
Electronics, mechanical design and embedded work — projects where the hard part was a real object behaving predictably.
engineering
0611
Power Amplifier for B–H Characterisation
A transformer-less, direct-coupled linear amplifier that drives magnetic cores from 50 Hz to 250 kHz, so their B–H loops can be measured across four decades of frequency.
Analogue design · KiCad · Proteus · MATLAB
IITB-RISC — a 6-stage pipelined processor
A 16-bit pipelined CPU in VHDL: eight registers, three instruction formats, six stages, and the forwarding and interlock logic needed to keep them fed.
VHDL · Digital design · Computer architecture
IoT Visitor Counter
Two ultrasonic sensors in a doorway, an Arduino working out which way you walked, and a NodeMCU putting the room’s occupancy on the internet.
Arduino · NodeMCU · HC-SR04 · Adafruit IO
XLR8 — an Android-controlled bot
A differential-drive racing bot driven from a phone, on a motor driver board I laid out myself because the ready-made one was the wrong shape.
ATTINY2313A · L293D · Eagle · Bluetooth
Solar-Powered E-Bicycle
A hub motor, a controller and a panel on a bicycle — and two small ideas about when the motor should be allowed to help. Built at thirteen.