“Wanjiku” Ventilator Do it yourself (DIY) using a Direct Current (DC) Motor

“Wanjiku” Ventilator Do it yourself (DIY) using a Direct Current (DC) Motor

For construction of the “Wanjiku”ventilator using direct current(DC) motor we need:

  • A piece of wood
  • A hinge
  • A dc motor bracket
  • Apiece of “shock absorbers”
  • DC motor.

Assembling the parts together:

  1. Cut the wood in two pieces as desired to make the pressing arm and the base of the ventilator. 


  1. Hinge the pieces of wood together one side.
  • Cut a piece of “shock absorber” and place it on the wood as a base for the Ambu bag.
  1. After assembling the parts together:

For rotating the dc motor we need to connect the Arduino circuit.

The components required are as follows:

  • Arduino Duemilanov
  • DRV8871 dc motor driver
  • Potentiometers
  • Breadboard and Jumper wire
  • 12v 2A Adaptor

The DRV8871 device is an optimized 8-pin device for driving DC motors with 6.5 to 45 V and up to 3.6- A peak current. Check out its data sheet for more info: http://www.ti.com/lit/ds/symlink/drv8871.pdf?&ts=1589266356250

The electrical connections are as shown in the circuit diagram below:

Connection description:

  1. PIN 1 and PIN 2 from the driver connected to red and white terminals of the dc motor.
  2. The blue wire of the motor to Arduino 5v, green to ~3 of the Arduino, Black to the GND of Arduino and yellow is open. 
  3. IN1 and IN 2 pins of the driver are connected to the pin 8 and pin 9 of the Arduino.
  4. +VE and -VE of the driver connected to power supply.
  5. Vm and GND pin of the driver connected to Vin and GND of the Arduino. This is used to power the Arduino board
  6. The wipers of the potentiometers connected to pins A0 and A1 of the Arduino. The other two pins of the potentiometer to 5V and GND.

Here’s the Arduino circuit connection diagram:

The total Cost of assembling the ventilator is less than KES 20, 000 .

For commercial production or incase one needs us to assemble the ventilator for them you can reach us on below contacts