Hi Jim, I cleared the buffer during the setup and all's working perfectly now. Many thanks for your help. (Anyway, I'm still surprised the reset doesn't clear the buffer and set the interrupt line high) ++by Gilles BILLARD - Serial & I2C Devices
Thanks Jim, 1) That's it ! 2) The device is perfectly running on I2C mode 3) That is the very line I use. Let's have a look on the screenshots: Just after power on (no key hit), if I dont read the buffer, I see no pulse on trigger pin, it is low and stays low; I can only see the scanning pulses of the rows on probe 2 when a key is hit. If I read the buffer, an interrupt pulse occursby Gilles BILLARD - Serial & I2C Devices
Hi, No answer on Arduino spécific forum... but: To me, it is not an Arduino issue. I put a oscilloscope on the board to check the signals. Probe 1 set on int line (pin9) Probe 2 set on keyboard column 1 (i'd like to put screen shots, but I dont know how...) If I dont read the buffer, I see no pulse on trigger pin; I can only see the scanning pulses of the rows on probe 2 when the key is hby Gilles BILLARD - Serial & I2C Devices
Okay, thanks, I'll do that. ++by Gilles BILLARD - Serial & I2C Devices
Hi, I have an issue dealing with interrupt from pin9 of a 4618. I try to have fun with the design of an acces control. I use an Arudino UNO + BV kit with a 4618, a keypad, a 4 lines LCD and a RFID reader. I wish I use inetrrupts lines to trigger the code; INT0 from BV4618, INT1 from tag reader. Your doc says: "When there is a value in the key buffer the nInt line will go low and remby Gilles BILLARD - Serial & I2C Devices