Mike here is a nice video I found using that chip to source I would try what pancake said. Drive one pin on the source hi and the uln2803 the hi and see if you could manually turn them on. I really done see a issue with how you built the circuit. I don't have any source drivers to built it. I've used the uln2803 for all sorts of things. Let us know what you find. I'm thinking about making a cube they are amazing to watch! Good Luck Don
watch this video I was looking at some of his other videos and thought it would help you understand the 74hc595 latching and driving the outputs. If you watch the first part you will see why didn't build this board with the 164 shift register. The relays would chatter as data is shifted into the register. I hope that helps you good luck. Where did you purchase this board at?
Hi I'm looking on some information on how compute miles per hour from a round disc that has 32 shaded area or slots using a photo transistor and led. I'm planning on using external interrupt on the Arduino to detect a shaded area on the disc. Say I count how many pulses that have been count in 1 second. Don
on the relay board pin 4 goes to the 74hct95 pins 12 and 13. I think that after you send the shiftout command then you pulse pin 4 high then low. It has to be low to get the data to appear on the output to drive the relays. In your source I see a variable given but you don't use it in loop. You use data which I didn't see you define it. I'm kinda new to Arduino but have been using AVR Assembler for years.
Since you are using 24volt AC a Traic would be needed and not a transistor. Traics are used to switch AC devices. Watch this video it has a circuit. I like the MOC3041 because it fully isolates the micro controller from the load. http://youtu.be/5tt4zAkpDPw Don
Thanks AWOL I saw "Shannon" but didn't read it all Shannon Member. There is sure some give a take will Arduino where it is very easy to perform serial communitions. PWM, delays, etc. I have a JTAGICE mkii for debugging the avr. What do you use to debug the Ardunio I have been using serial.print for now. I have a module in my old logic analyzer that works with spi and ic2, 3 wire. I'm making a library to send data from the Arduino to logic analyzer using spi. Don
I should have added that I have a parallel controller with a HD44780 controller. You need 6 pins to control it 4 for data and 1 for register select 1 for enable. I have a bunch of them. I don't have any serial modules. Don
Hi I was wondering how to connect and communicate to a LCD Display in 4 bit mode. I understand how to use digitalWrite() to control pins E and RS on the lcd module but how do I access 4 pins at once. In AVR Assembler I would mask the data and write it to a port say PORTB. I'm new to Arduino and trying to learn more about it. Thanks Don