Metro with original wheels and my, more colorful, rockered test setup Continue reading →
While I was finalizing e-snowflake project, I imagined that single RGB 5050 LED would create nice rainbow effect if placed inside a ball like ping-pong. You can find plenty of such projects on the net, this one was heading to embed everything within ping-pong, battery included. The design challenge was to create PCB small enough to fit into ping-pong, design electronic on/off power switch and to supply LED with forward voltage drop higher than… Continue reading →
Thunderbolt that hits near a long cable line can induce spike of hundred of volts. Budgetary RS-485 driver will not protect circuitry from damages caused by over-voltage and over-current. While scorched prototyped device makes constructor sad, failure to bunch of production-grade devices leads to financial impact: loss of hardware, maintenance time and penalties from SLA breaches. My first considerations focused on choice of right cable – I p… Continue reading →
Test scenario – diagram Continue reading →
Birthday cake test for color changes on single print Continue reading →
When fridge got me popping sound and display turned black, I realized that 10 years old Whirlpool went out of service. My “damn it” comment was quickly followed by my wife: “You are going abroad next week! What we do now?”. Considering subtle smell of magic smoke I felt next to fridge’s back, I knew any repair shop will simply get me new control module, and these are overpriced, sometimes… Continue reading →
