11 Results for "ULN2803A"

Raspberry Pi Connection
Log from Digital Stamp with Inkjet Printing
I connected the RasPi with an old floppy IDE cable (cut at one end). It has 8 more pins than the Raspberry Pi, so these are ignored (would be cable ids 27-34).Here is the mapping of RasPi pins to floppy cable ids (only the first 26 of 34 can have a connection):Mapping...

Raspberry talking to the relay
Log from Sous Vide cooker and more
Since the Raspberry GPIO only support 3.3V and the Sainsmart relay module need 5V to switch the relay I used a ULN2803A and an external power supply (the same I use to power the Raspberry PI, since it supports more then enough amps) to operate the optical...

V2.1 is on the horizon!
Log from ZTO-80 Computer System
Recently, I have been putting my full focus of the project on designing and refining the SBC V2.1. I have some great new features on it while keeping the PCB just about the same size. The largest of the additions is likely the new expansion bus, which...

Testing v3.0
Log from ZTO-80 Computer System
Hi everyone, Over the past couple of weeks, I've been working hard to test all of the features of the SBC v3.0. When I first plugged in the board to test it after soldering, I was sad to find that it did not work immediately, which I had hoped it would....

Version 1.0 Nanocomp uses same Monitor as 1981 version
Log from Nanocomp 6809 8 Bit Retro Computer on Breadboards
Version 1.0 of the Nanocomp was built to re-use the original Monitor ROM (though copied onto a new EEPROM) and uses almost the same design. There have been a few updates. The original RAM used 2 x 2114 1Kx4 bit Static RAM. These have been replaced with...

Flipdot prototype BOM
Log from Flip-Dot Display & DIY Controller
With the PCB on their way and expected to arrive next week, it was time to order the components required for the assembly. Here is a table with the references used, quantity and unit price (for ONE display). DescriptionReferenceQuan-tityUnit PriceTotal...

Prototype
Log from IoT RGB Led Cube 4x4x4 with Bluetooth
This was originally published on my blog: chris-labs.deThis is the second part of my RGB-Cube series (here's the first) which describes my process of forming an idea to a working prototype. After spending hours of reading and ordering the first parts...

PCB components
Log from Microfluidics control system
Now that we know what pneumatic components and microcontroller we are using, let's go over how to interface the two. The solenoid valves are controlled individually: apply 12V to power them on; open the circuit to shut them off (or vice-versa, for...

Circuit Development Part 1 - Light Control
Log from Kerbal Spaceship Potato
PCB development is ongoing! After talking to the amazing Kicad forum people about how to design an amateur-friendly PCB without soldermask, I was convinced that I should just send a design to a board house. This means I want to be extra sure my...

9. Sorting Objects With A 3D Magnetic Sensor - Part 1
Log from Work-holding Robotic Arm for Electronic Workshop
In this chapter I'm going to show how to detect objects using the 3D Magnetic Sensor 2Go TLE493D, the robot arm, and the PSoC 62S2 WiFi BT Pioneer Board. In the figure below I show you the electrical diagram used in this chapter. In the figure below...

Artificial Neural Network-based Mechanical Faults Diagnosis (II)
Log from Retro-futuristic automobile control panel
A.K.A. the "Blonde Power"As presented in Science time (I): Artificial Neural Network-based mechanical faults diagnosis (I), this system is based on a hardware implementation of artificial neural network encapsulated into an IC called HM2007 which is...