MicroPython ESP8266 Nokia 5110 Quad 7-segment

A MicroPython library for emulating a quad 7-segment LED display modules using a Nokia 5110 display with PCD8544 driver.

The 84x48 PCD8544 buffer:

They are called 7-segment displays as there are 7 LEDs for each digit (segment). One byte (7 lower bits) for each segment. The 8th bit (MSB) is for the decimal point.

      A
     ---
  F |   | B
     -G-
  E |   | C
     ---   * H
      D

  HGFEDCBA
0b01101101 = 0x6D = 109 = show "5"

Display	Bin	Hex	Dec
0	0b00111111	0x3F	63
1	0b00000110	0x06	6
2	0b01011011	0x5B	91
3	0b01001111	0x4F	79
4	0b01100110	0x66	102
5	0b01101101	0x6D	109
6	0b01111101	0x7D	125
7	0b00000111	0x07	7
8	0b01111111	0x7F	127
9	0b01101111	0x6F	111
A	0b01110111	0x77	119
b	0b01111100	0x7C	124
C	0b00111001	0x39	57
d	0b01011110	0x5E	94
E	0b01111001	0x79	121
F	0b01110001	0x71	113
G	0b00111101	0x3D	61
H	0b01110110	0x76	118
I	0b00000110	0x06	6
J	0b00011110	0x1E	30
K	0b01110110	0x76	118
L	0b00111000	0x38	56
M	0b01010101	0x55	85
n	0b01010100	0x54	84
O	0b00111111	0x3F	63
P	0b01110011	0x73	115
q	0b01100111	0x67	103
r	0b01010000	0x50	80
S	0b01101101	0x6D	109
t	0b01111000	0x78	120
U	0b00111110	0x3E	62
v	0b00011100	0x1C	28
W	0b00101010	0x2A	42
X	0b01110110	0x76	118
y	0b01101110	0x6E	110
Z	0b01011011	0x5B	91
blank	0b00000000	0x00	0
-	0b01000000	0x40	64
*	0b01100011	0x63	99

Parts

• WeMos D1 Mini $4.00 USD
• Nokia 5110 module $2.10 USD
• Breadboard 400 point $1.02 USD
• Jumper wire $1.72 USD

Connections

WeMos D1 Mini	Nokia 5110 PCD8544 LCD
D3 (GPIO0)	0 RST
D4 (GPIO2)	1 CE
D8 (GPIO15)	2 DC
D7 (GPIO13)	3 Din
D5 (GPIO14)	4 Clk
3V3	5 Vcc
D6 (GPIO12)	6 BL
G	7 Gnd

Links

• MicroPython PCD8544 Driver
• WeMos D1 Mini
• micropython.org
• TM1637 version

License

Licensed under the MIT License.