Also, if I use the shield, can I not use them (50 - 53) for digital IO. So how can Mega use these pins to communicate with the shield. I am never able to get the HC-05 to return any data. I have read probably a dozen examples and tried probably 6 different scripts with no success. ![]() What I am trying to do is put the HC-05 in AT command mode. The shield is compatible with UNO and Mega, so placed over and extends the same pins (0 - SCL & A5 - IOREF), it can't be placed over 50, 51, 52 on Mega. I have spent a number of hours trying to connect an HC-05 bluetooth module to my Mega 2560. On the Mega, the hardware SS pin, 53, is not used to select either the W5500 or the SD card, but it must be kept as an output or the SPI interface won't work. These pins cannot be used for general I/O. On both boards, pin 10 is used to select the W5500 and pin 4 for the SD card. According to the Arduino store, the Mega and Mega2560 both use the same chip - How can tone() take out two PWM pins on the Mega 2560 but not take out those pins on the Mega, if they both use the same chip What is different There is only one Mega - with the 2560 chip. This is on digital pins 10, 11, 12, and 13 on the Uno and pins 50, 51, and 52 on the Mega. On the Mega, the hardware SS pin, 53, is not used to select the Ethernet controller chip, but it must be kept as an output or the SPI interface won't work.Īrduino communicates with both the W5500 and SD card using the SPI bus (through the ICSP header). This is on digital pins 11, 12, and 13 on the Uno and pins 50, 51, and 52 on the Mega. External Interrupts: 2 (interrupt 0), 3 (interrupt 1), 18 (interrupt 5), 19 (interrupt 4), 20 (interrupt 3), and 21 (interrupt 2).' 'interrupts 0 and 1 are on digital pins 43 and 44.' These refer to physical package pins 43 and 44, PortD bit 0 and 1. The Arduino board communicates with the shield using the SPI bus. ![]() Now I wish to do the same on Arduino Mega 2560 Board. ![]() Just starting with Mega and bit confused about the documentation. Hi, I have developed a sketch working on Arduino UNO, to enable interrupts on the following pins: D4, D12, A0-A5.
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