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esp32_gpio_lcd_test.py
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"""Implements a HD44780 character LCD connected via ESP32 GPIO pins."""
from machine import Pin
from esp32_gpio_lcd import GpioLcd
from utime import sleep_ms, ticks_ms
# Wiring used for this example:
#
# 1 - Vss (aka Ground) - Connect to one of the ground pins on you pyboard.
# 2 - VDD - I connected to VIN which is 5 volts when your pyboard is powered via USB
# 3 - VE (Contrast voltage) - I'll discuss this below
# 4 - RS (Register Select) connect to G4 (as per call to GpioLcd)
# 5 - RW (Read/Write) - connect to ground
# 6 - EN (Enable) connect to G11 (as per call to GpioLcd)
# 7 - D0 - leave unconnected
# 8 - D1 - leave unconnected
# 9 - D2 - leave unconnected
# 10 - D3 - leave unconnected
# 11 - D4 - connect to G5 (as per call to GpioLcd)
# 12 - D5 - connect to G18 (as per call to GpioLcd)
# 13 - D6 - connect to G21 (as per call to GpioLcd)
# 14 - D7 - connect to G22 (as per call to GpioLcd)
# 15 - A (BackLight Anode) - Connect to VIN
# 16 - K (Backlight Cathode) - Connect to Ground
#
# On 14-pin LCDs, there is no backlight, so pins 15 & 16 don't exist.
#
# The Contrast line (pin 3) typically connects to the center tap of a
# 10K potentiometer, and the other 2 legs of the 10K potentiometer are
# connected to pins 1 and 2 (Ground and VDD)
#
# The wiring diagram on the following page shows a typical "base" wiring:
# http://www.instructables.com/id/How-to-drive-a-character-LCD-displays-using-DIP-sw/step2/HD44780-pinout/
# Add to that the EN, RS, and D4-D7 lines.
def test_main():
"""Test function for verifying basic functionality."""
print("Running test_main")
lcd = GpioLcd(rs_pin=Pin(4),
enable_pin=Pin(17),
d4_pin=Pin(5),
d5_pin=Pin(18),
d6_pin=Pin(21),
d7_pin=Pin(22),
num_lines=2, num_columns=20)
lcd.putstr("It Works!\nSecond Line\nThird Line\nFourth Line")
sleep_ms(3000)
lcd.clear()
count = 0
while True:
lcd.move_to(0, 0)
lcd.putstr("%7d" % (ticks_ms() // 1000))
sleep_ms(1000)
count += 1