This sketch is supposed to test Dragino RS485-BL (Modbus master), using an Arduino UNO as a Modbus slave. The Dragino will be configured to read data stored in Arduino variables (an array), when ...

const int ledCount = 8; // the number of LEDs in the bar graph int ledPins[] = {2, 3, 4, 5, 6, 7, 8, 9}; // an array of pin numbers to which LEDs are attached ...