BT21603 modules equivalent, 3 mm character height lcd modules.
GND (0 V) Power Supply (5 V) Supply Voltage (LCD Driver) Register Select - LOW = Instruction, High = Data Read / Write LOW = MPU to LCM, High = LCM to MPU Enable R / W = LOW: Data are taking over at falling edge of E R / W = HIGH: Data can be read at.
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