Category Archives: ULN2803

Motor DC Control (1 direction only) Using ULN2803 (Darlington Array Transistor)

by : Antonius (@sw0rdm4n)

http://www,ringlayer.net

Part List(s)
– 1 Ceramic Disc Capacitors 50V 100nF
– 1 Mini Breadboard
– 1 uln2803
– Arduino / any compatible board
– 1 Tamiya single Gearbox
– 2 Wheel for tamiya gearbox
– Jumper Wires
– 6 v battery holder
– 4 x 1,5v battery
– 1 dc motor (toy)
– Soldering iron and tin

ULN 20803 is a darlington array transistor with 8 channel(s) suitable to control devices up to 500mA , 50v, the specification can be downloaded from here http://www.adafruit.com/datasheets/ULN2803A.pdf.

Here in this example we will use uln2803 to control a motor dc that uses single gearbox, since uln2803 isn’t a h-bridge so we will only able to control it with single direction ( for h-bridge, we may use tlc5940 ).

Here’s uln2803 pins:

uln2803

In this example, we will be using pin 1 as pwm pulse receiver from arduino pin 7 output. and pin 9 will be for ground connect to arduino’s ground. How to locate where’s pin 1 and another ? We can see on uln2803 that it has a “U” sign. The “U” sign determines that pin 1 is located on the left of that “U” sign.

First Step
Plug and solder jumper wire and ceramic disc capacitor into motor dc as follow:

uln1

Next plug the dc motor into tamiya single gearbox and plug some wheels. Here comes it :

x

As if this is a small vehicle, but it has no steering capabilities.

Second Step

connect pin 1 on uln2803 with pin 7 on arduino and connect ground pin (9) on uln2803 to ground pin on arduino.

20141118_065032

Next, connect both jumper from motor dc to pin 18 and pin 10 on uln2803

correct1

Next, connect ground from battery to ground pin 9 on uln2803, plug it beside ground pin from arduino, and plug volt from battery to pin 10 on uln 2803, plug it besides motor dc jumper wire as follow:

correct2

Final step is to upload this code:

int motor = 7;
void setup() {                
   pinMode(motor, OUTPUT);   
}

void loop() {
   digitalWrite(motor, HIGH);
   delay(300);   
   digitalWrite(motor, LOW);
   delay(1000);   
}

Once everything done, we can move the motor each 1 second about 0,3 second as follow:

Advertisements