Use of the TM1637 display by ESP32 board

ESP32 03-01-24

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Tutorial plan

1- What is the TM1637 display ?

2- How ESP32 board displays text in TM1637 display ?

3- The components necessary to display texts on the TM1637 display using the ESP32 card

4- ESP32 board wiring diagram with TM1637 display

5- Programming the ESP32 board with MicroPython to display text in the TM1637 display

What is the TM1637 display ?

The TM1637 is a commonly used display driver chip designed to control 7-segment LED displays. It's often used to interface with digital clocks, temperature displays, and other numeric output devices. The chip handles the multiplexing of the display, making it easier to control and display numbers or characters with minimal pin usage on microcontrollers or embedded systems. It communicates via a simple 2-wire interface, making it quite popular among hobbyists and in various electronic projects due to its ease of use and versatility.

How ESP32 board displays text in TM1637 display ?

To display text on a TM1637 display using an ESP32 board and MicroPython, you'd need to perform several steps:

1. MicroPython Firmware Installation:

Flash MicroPython firmware onto your ESP32 board. You can use tools like esptool to accomplish this.

2. Library Installation:

Obtain the TM1637 MicroPython library files (e.g., tm1637.py) compatible with MicroPython.

3. Hardware Connection:

Ensure proper wiring between the TM1637 display and the ESP32 board (clock, data pins, etc.).

4. File Transfer:

Use tools like Thonny and UpyCraft or the built-in file editor on a MicroPython-compatible board to transfer the tm1637.py library file and your script.

5. Writing MicroPython Code:

Write the MicroPython code to control the TM1637 display.

The components necessary to display texts on the TM1637 display using the ESP32 card

To use the TM1637 display with ESP32 card, you'll need the following components:

ESP32 Board:

ESP32 card

The ESP32 is a powerful microcontroller widely used in various embedded applications, IoT (Internet of Things) projects, and prototyping due to its extensive features and capabilities.

TM1637 Display

This display is used for displaying numbers, symbols and letters.

Jumper Wires:

Jumper wires

To make the physical connections between the components.

ESP32 board wiring diagram with TM1637 display

Connect the TM1637 Display to ESP32 card as follows:

1- Connect the VCC pin of the TM1637 display to 3.3V pin of ESP32

2- Connect the GND pin of the TM1637 display to GND pin of ESP32

3- Connect the CLK pin of the TM1637 display to GPIO 2 of ESP32

4- Connect the DIO pin of the TM1637 display to GPIO 4 of ESP32

Programming the ESP32 board with MicroPython to display text in the TM1637 display

To program an ESP32 board using MicroPython to display text on a TM1637 display, you'll need to perform the following steps:

1- MicroPython Firmware: Ensure that your ESP32 board is flashed with MicroPython firmware. You can use tools like esptool to flash the firmware onto the board.

2- TM1637 MicroPython Library: Obtain the MicroPython library for the TM1637 display. This library should include necessary methods to control the display.

3. Transfer Library and Script:

Use tools like Thonny and UpyCraft or the built-in file editor on a MicroPython-compatible board to transfer the tm1637.py library file and your script.

4. Write MicroPython Code:

Use a code structure similar to the following example:

import tm1637
from machine import Pin
tm = tm1637.TM1637(clk=Pin(2), dio=Pin(4))

# all LEDS on "88:88"
tm.write([127, 255, 127, 127])
tm.write(bytearray([127, 255, 127, 127]))
tm.write(b'\x7F\xFF\x7F\x7F')
tm.show('8888', True)
tm.numbers(88, 88, True)

# all LEDS off
tm.write([0, 0, 0, 0])
tm.show('    ')

# write to the 2nd and 3rd segments only
tm.write([119, 124], 1) # _Ab_
tm.write([124], 2) # __b_
tm.write([119], 1) # _A__

# display "0123"
tm.write([63, 6, 91, 79])
tm.write(bytearray([63, 6, 91, 79]))
tm.write(b'\x3F\x06\x5B\x4F')
tm.show('1234')
tm.number(1234)
tm.numbers(12, 34, False)

# display "4567"
tm.write([102, 109, 125, 7])
tm.write([102], 0) # 4___
tm.write([109], 1) # _5__
tm.write([125], 2) # __6_
tm.write([7], 3)   # ___7

# set middle two segments to "12", ie "4127"
tm.write([6, 91], 1) # _12_

# set last segment to "9", ie "4129"
tm.write([111], 3) # ___9

# show "AbCd"
tm.write([119, 124, 57, 94])
tm.show('abcd')

# show "COOL"
tm.write([0b00111001, 0b00111111, 0b00111111, 0b00111000])
tm.write([0x39, 0x3F, 0x3F, 0x38])
tm.write(b'\x39\x3F\x3F\x38')
tm.write([57, 63, 63, 56])
tm.show('cool')
tm.show('COOL')

# display "dEAd", "bEEF"
tm.hex(0xdead)
tm.hex(0xbeef)
tm.show('dead')
tm.show('Beef')

# show "12:59"
tm.numbers(12, 59)
tm.show('1259', True)

# show "-123"
tm.number(-123)
tm.show('-123')

# Show Help
tm.show('Help')
tm.write(tm.encode_string('Help'))
tm.write([tm.encode_char('H'), tm.encode_char('e'), tm.encode_char('l'), tm.encode_char('p')])

# Scroll Hello World from right to left
tm.scroll('Hello World') # 4 fps
tm.scroll('Hello World', 1000) # 1 fps

# Scroll all available characters
tm.scroll(list(tm1637._SEGMENTS))

# all LEDs dim
tm.brightness(0)

# all LEDs bright
tm.brightness(7)

# converts a digit 0-0x0f to a byte representing a single segment
# use write() to render the byte on a single segment
tm.encode_digit(0)
# 63

tm.encode_digit(8)
# 127

tm.encode_digit(0x0f)
# 113

# 15 or 0x0f generates a segment that can output a F character
tm.encode_digit(15)
# 113

tm.encode_digit(0x0f)
# 113

# used to convert a 1-4 length string to an array of segments
tm.encode_string('   1')
# bytearray(b'\x00\x00\x00\x06')

tm.encode_string('2   ')
# bytearray(b'[\x00\x00\x00')

tm.encode_string('1234')
# bytearray(b'\x06[Of')

tm.encode_string('-12-')
# bytearray(b'@\x06[@')

tm.encode_string('cafe')
# bytearray(b'9wqy')

tm.encode_string('CAFE')
# bytearray(b'9wqy')

tm.encode_string('a')
# bytearray(b'w\x00\x00\x00')

tm.encode_string('ab')
# bytearray(b'w|\x00\x00')

# used to convert a single character to a segment byte
tm.encode_char('1')
# 6

tm.encode_char('9')
# 111

tm.encode_char('-')
# 64

tm.encode_char('a')
# 119

tm.encode_char('F')
# 113

# display "dEAd", "bEEF", "CAFE" and "bAbE"
tm.hex(0xdead)
tm.hex(0xbeef)
tm.hex(0xcafe)
tm.hex(0xbabe)

# show "00FF" (hex right aligned)
tm.hex(0xff)

# show "   1" (numbers right aligned)
tm.number(1)

# show "  12"
tm.number(12)

# show " 123"
tm.number(123)

# show "9999" capped at 9999
tm.number(20000)

# show "  -1"
tm.number(-1)

# show " -12"
tm.number(-12)

# show "-123"
tm.number(-123)

# show "-999" capped at -999
tm.number(-1234)

# show "01:02"
tm.numbers(1, 2)

# show "0102"
tm.numbers(1, 2, False)

# show "-5:11"
tm.numbers(-5, 11)

# show "12:59"
tm.numbers(12, 59)

# show temperature '24*C'
tm.temperature(24)
tm.show('24*C')

# show temperature works for range -9 to +99
tm.temperature(-10) # LO*C
tm.temperature(-9)  # -9*C
tm.temperature(5)   #  5*C
tm.temperature(99)  # 99*C
tm.temperature(100) # HI*C

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import tm1637

from machine import Pin

tm = tm1637.TM1637(clk=Pin(2), dio=Pin(4))

# all LEDS on "88:88"

tm.write([127, 255, 127, 127])

tm.write(bytearray([127, 255, 127, 127]))

tm.write(b'\x7F\xFF\x7F\x7F')

tm.show('8888', True)

tm.numbers(88, 88, True)

# all LEDS off

tm.write([0, 0, 0, 0])

tm.show(' ')

# write to the 2nd and 3rd segments only

tm.write([119, 124], 1) # _Ab_

tm.write([124], 2) # __b_

tm.write([119], 1) # _A__

# display "0123"

tm.write([63, 6, 91, 79])

tm.write(bytearray([63, 6, 91, 79]))

tm.write(b'\x3F\x06\x5B\x4F')

tm.show('1234')

tm.number(1234)

tm.numbers(12, 34, False)

# display "4567"

tm.write([102, 109, 125, 7])

tm.write([102], 0) # 4___

tm.write([109], 1) # _5__

tm.write([125], 2) # __6_

tm.write([7], 3) # ___7

# set middle two segments to "12", ie "4127"

tm.write([6, 91], 1) # _12_

# set last segment to "9", ie "4129"

tm.write([111], 3) # ___9

# show "AbCd"

tm.write([119, 124, 57, 94])

tm.show('abcd')

# show "COOL"

tm.write([0b00111001, 0b00111111, 0b00111111, 0b00111000])

tm.write([0x39, 0x3F, 0x3F, 0x38])

tm.write(b'\x39\x3F\x3F\x38')

tm.write([57, 63, 63, 56])

tm.show('cool')

tm.show('COOL')

# display "dEAd", "bEEF"

tm.hex(0xdead)

tm.hex(0xbeef)

tm.show('dead')

tm.show('Beef')

# show "12:59"

tm.numbers(12, 59)

tm.show('1259', True)

# show "-123"

tm.number(-123)

tm.show('-123')

# Show Help

tm.show('Help')

tm.write(tm.encode_string('Help'))

tm.write([tm.encode_char('H'), tm.encode_char('e'), tm.encode_char('l'), tm.encode_char('p')])

# Scroll Hello World from right to left

tm.scroll('Hello World') # 4 fps

tm.scroll('Hello World', 1000) # 1 fps

# Scroll all available characters

tm.scroll(list(tm1637._SEGMENTS))

# all LEDs dim

tm.brightness(0)

# all LEDs bright

tm.brightness(7)

# converts a digit 0-0x0f to a byte representing a single segment

# use write() to render the byte on a single segment

tm.encode_digit(0)

# 63

tm.encode_digit(8)

# 127

tm.encode_digit(0x0f)

# 113

# 15 or 0x0f generates a segment that can output a F character

tm.encode_digit(15)

# 113

tm.encode_digit(0x0f)

# 113

# used to convert a 1-4 length string to an array of segments

tm.encode_string(' 1')

# bytearray(b'\x00\x00\x00\x06')

tm.encode_string('2 ')

# bytearray(b'[\x00\x00\x00')

tm.encode_string('1234')

# bytearray(b'\x06[Of')

tm.encode_string('-12-')

# bytearray(b'@\x06[@')

tm.encode_string('cafe')

# bytearray(b'9wqy')

tm.encode_string('CAFE')

# bytearray(b'9wqy')

tm.encode_string('a')

# bytearray(b'w\x00\x00\x00')

tm.encode_string('ab')

# bytearray(b'w|\x00\x00')

# used to convert a single character to a segment byte

tm.encode_char('1')

# 6

tm.encode_char('9')

# 111

tm.encode_char('-')

# 64

tm.encode_char('a')

# 119

tm.encode_char('F')

# 113

# display "dEAd", "bEEF", "CAFE" and "bAbE"

tm.hex(0xdead)

tm.hex(0xbeef)

tm.hex(0xcafe)

tm.hex(0xbabe)

# show "00FF" (hex right aligned)

tm.hex(0xff)

# show " 1" (numbers right aligned)

tm.number(1)

# show " 12"

tm.number(12)

# show " 123"

tm.number(123)

# show "9999" capped at 9999

tm.number(20000)

# show " -1"

tm.number(-1)

# show " -12"

tm.number(-12)

# show "-123"

tm.number(-123)

# show "-999" capped at -999

tm.number(-1234)

# show "01:02"

tm.numbers(1, 2)

# show "0102"

tm.numbers(1, 2, False)

# show "-5:11"

tm.numbers(-5, 11)

# show "12:59"

tm.numbers(12, 59)

# show temperature '24*C'

tm.temperature(24)

tm.show('24*C')

# show temperature works for range -9 to +99

tm.temperature(-10) # LO*C

tm.temperature(-9) # -9*C

tm.temperature(5) # 5*C

tm.temperature(99) # 99*C

tm.temperature(100) # HI*C

Upload the code to ESP32 board.

Following these steps should enable you to display text on a TM1637 display using an ESP32 board programmed with MicroPython.

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Use of the TM1637 display by ESP32 board

Tutorial plan

1- What is the TM1637 display ?

2- How ESP32 board displays text in TM1637 display ?

3- The components necessary to display texts on the TM1637 display using the ESP32 card

4- ESP32 board wiring diagram with TM1637 display

5- Programming the ESP32 board with MicroPython to display text in the TM1637 display

What is the TM1637 display ?

How ESP32 board displays text in TM1637 display ?

The components necessary to display texts on the TM1637 display using the ESP32 card

ESP32 board wiring diagram with TM1637 display

Programming the ESP32 board with MicroPython to display text in the TM1637 display

3. Transfer Library and Script:

4. Write MicroPython Code:

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