sugar_44keytouchkeyboard
Sugar - 4*4 Touch Keyboard
Features
Signal:Time domain signal - analog serial port protoco
Module Principle
There is capacitance between any two conductive objects. The size of the capacitance is related to the conductive properties of the dielectric, the size and conductive properties of the plates, and the presence of conductive materials around the plates. The two exposed copper areas between PCB boards (or FPC) are the two plates of the capacitor, which is equivalent to a capacitor. When a human finger approaches the PCB, the capacitance changes due to the conductivity of the human body. When the touch key chip detects a significant increase in capacitance, it outputs a switch signal.
Used in FutureLite Board
Wiring
| Future Board Lite Interface | Cable | |||
|---|---|---|---|---|
 | Sugar LED Module | UART0 | Black PH2.0-4Pin Interface Cable |  |
Supports connecting to UART0, UART1
Pay attention to keeping the interface consistent with the actual interface when programming
Blocks-Function Description
| Serial Number | Block Image | Block Function |
|---|---|---|
| 1 |  | Initialize touch keyboard |
| 2 |  | Read pressed key value |
Program 1-Complete program
Cyclically read the keys pressed by the touch, and display the key values on the dot matrix of the color screen.
Note: The type of the value of the key position read by the program is a string, which cannot be compared with a number
Program 2-Complete Program
Implement complete password lock function, enter password in order, finally press # to end, compare with set password, if successful, display screen as green
Program 2 - Function Description
Program initialization: Set the color screen mode, the initial touch keyboard port
Before entering the password, the password and x variables need to be cleared to ensure that there is no data
- Read the keys in real time. When a key is pressed, add the current password bit to the main password string
- And display the currently entered password
- Wait for the key to be released, then enter the next password bit
- All password bits will be output until the # key is pressed. There is no limit on the number of password bits here
Compare the entered password with the set password, and display green if the input is correct Note: The set password needs to be added with #
Using Kittenblock
How to run your program using offline download to check the effect
Using on Microbit
Programming platform
Microsoft MakeCode for micro:bit
Use Makecode programming platform
Add the Sugar Cube Plugin
Search for "Sugar" in the extensions, click "Add"
Circuit Connection
| Future Board Lite interface | Use cable | |||
|---|---|---|---|---|
| Sugar cube LED module | UART | Black PH2.0-4Pin interface cable | |
Support connecting to P2 and P12,Pay attention to interface consistency with the actual interface during programming
Example 1: Read the button and display
Case 2: Processing judgment based on key values
