Turn-key PCB assembly services in prototype quantities or low-volume to mid-volume production runs

Toilet buddy makes sure you left bathroom as you found it

There is some routine in a bathroom you have to do. These include closing toiled lid, switching lights off. These things especially we menfolk forget time to time. So Nicholas McClanahan built a battery powered Propeller device which makes sure you won’t forget these things. Toiled buddy does three main things: plays back flushing sounds when toilet seat is up; plays reminder sound to put toilet seat down when light is off and reminds to turn off light when toilet seat is down. All this is achieved with simple circuits. Light is detected with simple photo-resistor. Instead of measuring its voltage with ADC he has chosen to measure RC discharge time. Toilet seat is detected with IR detector circuit where IR diode and IR receiver is used. Infrared signal is modulated at 38kHz to avoid environmental noise. And finally Audio is generated out of stored wav files and played through digital pins. This device can be modified to work for different purposes like open door detector, doorbell, musical instrument and even more. Continue reading

Parallax Propeller music player

Building MCU based music player is a good exercise for hobbyists today. This time take a look at propeller based MP3 player design. It has everything a decent player has – a regulated power supply (9V battery), buttons, audio amplifier, accelerometer input, LED and SD card reader to read songs out of flash card. As project supposed to be finished in one day – this is pretty raw design with no intention to put it in to enclosure. Anyway it plays wav files as there is no mp3 encoder used. So be sure to pick large capacity SD card for mp3 to wav converted files. There were some intentions for future improvements where accelerometer would be used for basic controls. But for now – not bad for one day project. Continue reading