Half Adder Circuit With 0/1 Seven-Segment Readout
Explore a one-bit half adder using XOR and AND gates with two seven-segment displays for Sum and Carry. Includes a schematic, parts list and build notes.
Two-Digit CD4026 Event Counter With 7-Segment Displays
A 0–99 event counter using two CD4026 counter/decoder ICs and seven-segment displays, with button input, rollover carry and reset. Includes a schematic and parts list.
How to Check a PCB Footprint Before Ordering Boards
A practical pre-order PCB footprint checklist: verify part numbers, pin-to-pad mapping, dimensions, orientation, DRC results and fabrication outputs.
Arduino Modules and Shields: Compatibility Guide
Learn how Arduino boards, modules and shields work together. Check voltage, pins, buses and libraries, then build an I²C sensor logger.
FPGA Logic Analyser: Eight-Channel Project Brief
Design an eight-channel FPGA logic analyser with a protected 3.3 V input PCB, trigger capture and host software. Explore the proposed build and test plan.
RF-Controlled Robotic Arm Vehicle: Build Guide
Build an RF-controlled robotic arm vehicle with torque calculations, separate power rails, local Wi-Fi control and loss-of-link stopping.
LiFi Audio and Data Transmitter: Practical Build
Build a LiFi audio and data transmitter concept with a measured LED-to-photodiode data link, circuit, code and troubleshooting.
Biometric Vehicle Ignition: Safe Bench Prototype
Explore biometric vehicle ignition safely with an isolated fingerprint bench demonstrator, fault handling, privacy and recovery design.
Dual-Axis Solar Tracking System: Build and Test
Build a dual-axis solar tracking system with four LDRs, two servos and Arduino. Measure its real net gain against a fixed panel.
Arduino EEPROM Programmer: Build and Test Guide
Build an EEPROM programmer with Arduino and a 24LC256. Follow the wiring, code, testing and troubleshooting guide.