If you need to determine the level of fluid you might think of some type of float switch system like what is typically used in a sump pit or a toilet tank. This Capacitive Fluid Level Sensor by dragonator uses a capacitive effect of the fluid to determine the level. “The advantage of capacitive level sensors is that they can be used for basically any solid and liquid. They
Our friends over at Electro Labs has a new project out, it is a DIY LM1876 Audio Amplifier Project. As usual it is a start to finish project that has full details so you can build your own. “This is an audio power amplifier based on LM1876 which can deliver up to 20W per channel into 4 or 8 ohm load and guarantees less than 0.1% THD + N
Inside the custom 3D printed housing Pete Mills built a LED Tachometer which gets engine data from a Open XC ODB2 module via bluetooth. It is looking for RPM and headlight status data from the module to update the user display. The headlamp status is used to dim the LED display when the headlights are automatically turned on by the car. “An Arduino, some addressable LED’s, a bluetooth module,
At a glance this Robo Dog by M.C. Langer looks like something you might find in the toy section of your local department store. Check out the parts below that went into the building of it. “I used the following materials (probably you can easily find better materials and substitutes): 1 broken mouse (it doesn’t matter where you are; you can always find a broken mouse. Or you can “accidentally”
This is a cool plot clock made by Francisco Ramos Muñoz. It uses 3 mini servo motors, one to move the draw/erase mechanism up and down and two to move the print location. The lines are nice and straight so we can tell that some kinematic techniques have been employed here. The system is being controlled using an Arduino microcontroller and is sure entertaining to watch. If you are
This Etch a Sketch Clock is a great use of an old toy! “I use an Arduino driving two very cheap darlington stepper drivers with 64:1 internally reduced steppers for the drawing. For the rotation I’m using an Easy-Driver driving a Nema 17 stepper. I also have a DS1307RTC real time clock installed so it always knows the time. Setting the time is a one-off via USB connected to
 Check out this Dead Bug Style Bandpass Filter design by PA1ED. If you want great noise isolation a metal box is ideal, check out his FR4 box design! Great idea using FR4 for the PCBs and for the case.  “Because I don`t have a spectrum analyzer,I was not able to test it if the Bandpass filter was doing a good job on the frequency it was designed for.So
