7 segment display

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Introduction

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

7D-display-001.jpg

Hardware

    ESP            TM1637
    GPIO    <-->   CLK
    GPIO    <-->   DIO
    ESP            MAX7219
    GPIO    <-->   DIN
    GPIO    <-->   CLK
    GPIO    <-->   CS
    Power          chip
    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

7D-display-002.jpg

Displaying date.


7D-display-001.jpg

Displaying temperature.

4 digit display

7D-display-004.jpg

Displaying time.


7D-display-005.jpg

Displaying temperature.

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 "Display - 7 segment". Available in testing at the moment. Settings are as follows.

TM1637

7segment 001.PNG

If you use the 4 digit chip (TM1637) you only need two gpios.

MAX7219

7segment 002.PNG

If you use the 8 digit chip (MAX7219) you need three gpios.

Type of display information

Setting Information
Manual Display is manually updated sending commands (see below)
Clock - Blink Display is automatically updated with current time and blinking dot/lines
Clock - No Blink Display is automatically updated with current time and steady dot/lines
Date Display is automatically updated with current date


Commands

Command Value Extra information
7dn,<value> -999...9999
-9999999...99999999
Display the number (positive or negative). If you use decimal point and the number is longer than the display allows it will be rounded. 7dn, n stands for "number". Only used if set to "manual"!
7dt,<value> -99°...999°
-999999°...9999999°
Display the temperature (positive or negative). If you use decimal point and the number is longer than the display allows it will be rounded. 7dt, t stands for "temperature". Only used if set to "manual"!
7don - Turn the display on.
7doff - Turn the display off.
7db,<value> 0...15 Change the brightness of the display. Possible to dim it further if you disconnect the VCC (power it over the GPIOs). 7db, b stands for "brightness".