Make a Simple Ventilator - 1st part, the Ventilator Controller
In responding to the current world situation, cq. facing Covid-19 Pandemic so we try to design and to make devices to help people, so we herewith design the Simple Ventilator System (SVS ) that mainly using Ambu bag.
Hopefully, this system can help people with respiratory and this system can be made a semi-open system, open an option to be sold as a complete kit.
This Ventilator System contains 2 Electronic Circuit Boards, the Ventilator Controller & the Ventilator CPU. Herewith in this first section, we describe the Ventilator Controller which is based on Arduino's L293D Motor Driver Shield that is modified & be added for the HMI (Human Machine Interface) as follows:
1. As 2 pins for I2C protocol are needed, so modify connection pin D13 (suppose for I2C SCL) to pin D1 of Arduino board, but for connecting the 2 I2C ICs (the PCF8574 I/O Expander & the PCF8563T RTC IC) by cables to J20 port for SCL (D13), SDA (D12) & GND pin connection.
2. The PCF8574 I/O Expander will provide connections for 5 LEDs - L1 to L5 and 1 Buzzer as HMI outputs, 2 jumpers for setting as HMI inputs.
3. Add ESP-01 WiFi module via J13 hence make this system as Medical Internet of Things.
4. Add J16 for I2C connection i.e for external pressure sensor(s) as well as J10 & J17 but via separate I2C control by ESP-01 module.
5. Add U5 to accommodate on-board pressure sensor connection & its preconditioning circuit.
6. Add J5, J6, J7 & J8 for external sensor(s) or potentiometer for the setting.
7. Add J11 & J12 for connecting external switches.
Source: https://www.pcbgogo.com/Article/Make_a_Simple_Ventilator___1st_part__the_Ventilator_Controller.html
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