7 segment display

Introduction

The 7 segment plugin support two different chip types, the TM1637 (4 digits) and the MAX7219/21 (8 digits).

Hardware

    ESP            Keypad
    GPIO    <-->   SCL
    GPIO    <-->   SD0

    Power
    3.3V*   <-->   VCC
    GND     <-->   GND
    
    *Many 7 segment displays state that they need 5V to operate but we have successfully powered them using 3.3V.

8 digit display

4 digit display

ESP Easy

Use the device tab on the ESP Easy web interface and create a new task by editing one of the available tasks. Select "Keypad - ..." from the drop down box.

If you check "ScanCode" the key number will be reported and not the exponential numbering which is generally used when the module is set to allow multiple inputs simultaneously (if you use multi input the value will be the sum of all the pressed keys).

The values that this device reports will be as follows:

Key (ScanCode)	Value (8 key)	Value (16 key)	Extra information
1	257	1
2	514	2
3	1028	4
4	2056	8
5	4112	16
6	8224	32
7	16448	64
8	32896	128
9	-	256
10	-	512
11	-	1024
12	-	2048
13	-	4096
14	-	8192
15	-	16384
16	-	32768