140 Results for "ULN2003"

Electronics prototyping
Log from FED0
To plan out the electronics we will start with the following components:1) 5V 1/64 geared stepperfor pellet dispensing, with Uln2003 stepper driver 3) Micro-servo (note the one in the photo is continuous but we will use a non-continuous one in the final...

Assembly
Log from M&M Dispenser (for research use only!)
Here are photos from the assembly. If anyone is interested in replicating this I can write up more detailed instructions. Assembled ULN2003 stepper wing with IR beam-break (for detecting pellets) and 4-pin circular connector attached (for connecting...

Selecting Components
Log from Kupid
Selection of components is a major task in any project, with previous project exectuion using arduino and huge number of LED's, I used simple shift registers and ULN2003 - The software complexity increased many folds and I used to run into out-of-memory...

verified the board design
Log from blinking things
I hand wired a combo of NE555, CD4017 and two ULN2003 chips. I also spray painted the protoboard before that. The capacitor I chose is a bit too small, so the animation is a bit too fast. I'll need to grab a 2uF instead of a 1uF cap. Definitely need...

RigTig's Big 3D Printer
Instructions from RigTig's Big 3D Printer
Lots to say here, but not done yet. Very briefly: + 3D print plastic pieces+ load program to WiFi boards (EPS8266) for steppers + fit BYJ28 stepper motors and wire up the ULN2003 driver boards + WiFi + attach 3 motor blocks to walls (or other high supports)+...

Wiring Instructions
Instructions from Braille Printer
1. Plug the 28BYJ-48 Stepper Motors in to the ULN2003 stepper Drivers. one will be used to roll the paper along the y-axis and one will be for moving the 'print head along the x axis. 2. Connect the x axis driver to the arduino from its pins...

New motors on the way
Log from Cubetto Clone
There was a chassis with motors, and I thought they will be just fine. It looked good on preliminary tests, when they where controlled in a "classic" way, like an RC car. But that speed was too fast. Driving motors with ~30% PWM gave an acceptable speed,...

Powering 12 volt panel LED's with a Arduino using a transistor bank
Instructions from K9 Robot
You cannot directly drive 12V LEDs from a Arduino. I used 2 ULN2003 ICs I wired up the Arduino to pseudo random blink the Baomain 16mm push button momentary switches. Here is a good representation of the circuit in GIF format. You do...

Monitor Board
Log from WDR-1-Bit-Computer
A classic computer build isn't fully classic to me, until there is a panel full with blinkenlights!So of course, this is a goal for me as well. As LED Driver I just went with the same ones that were used on the original WDR computer, the ULN2003.To my...

FED0 Printed Circuit Board!
Log from FED0
I received the PCBs from Oshpark, in their beautiful After Dark color scheme!Here it is populated with the ULN2003 motor driver, TRRS audio jack, motor header, servo header, photointerrupter header, and 2 buttons and LEDs for user input/feedback! ...

Star Wars Greebles
Hacker page by davedarko
Look, what an awesome scene! But all I see is this fancy LED sequence thingy in the background and I want it!So I'm going classic here, 555 timer and a 4017 with an ULN2003. The LEDs are definitely smaller, but it all fits on my protoboard.... it wouldn't...

controlBoard - schematic and board information
Log from ramanPi - Raman Spectrometer
Note: This log entry is a living document. I'll be updating this post to reflect the current configuration as time goes on.. There will also be a log at the end of the post noting modifications to the log, etc.. UPDATED-----> 10.15.2014This log entry...

Experimental system
Log from Wearable Haptic Sensor
Drive problems After discovering that LED drivers are not the right solution for driving motors, I noticed that stepper motor driver boards use a ULN2003 motor driver chip. These are available on eBay for thin money, and I had a few lying around. The...

Update on Working on the electronics
Log from CNC Add-on: Rot. Laser Soldering Paste applicator
Here the schematics of the Teensy controlled board, which receive via UART the coordinates and "Spindle Speeds" from the USB-CNC card, the VFD feedback, and 6 buttons with leds. STOP PAUSE PLAY are transmitted back to the USB-CNC card (also an E-STOP),...

Stylin' safety jacket.
Instructions from Stylin' safety jacket.
Next I breadboarded up the shift registers to my Trinket and then to the matrix display. I used a handful of assorted transistors that were inside the clock for circuit protection, but I'll only post this circuit on request for two reasons: It seems...

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