Materials to be used

1、STONE STWI101WT-01

2、FTP thermal printer head

3、Raspberry Pi pico

4、Coin-operated machine

Function

The control function is displayed on the serial screen, the main 
interface selects the floor, after entering the main interface selects 
the parking space, at the same time it will display the parking space 
number in the text box on the top right, then selects the stay time, it 
is two scrolling text selectors, then also the same will display the 
order information in the text box on the top right, according to the 
fixed unit price which multiplies with the stay time to get the total 
price. Then only when the parking space and the stay time are selected, 
you can go to the payment button, otherwise it is invalid. After 
entering the payment screen, a coin acceptor will be used. Then the 
screen will show the number of coins to be put in and the number of 
coins already put in. After the coins have been put in, a payment 
success message will be displayed. Then you can choose to print a small 
ticket to print the place number and time on the thermal paper.

Circuit

I have design a circuit by myself in order to drive many components, and 
the overall circuit diagram is like this, the upper left corner is the 
communication socket and power supply socket, below there is a buzzer 
(not actually used in the circuit), there is a light-emitting diode on 
the right, and the lower right corner is a 30pin fpc for connecting the 
print head.