Show Posts
Pages: [1]
1  Using Arduino / Project Guidance / Re: HOWTO? debug using JTAG ICE when LCD shield with touchscreen is attached on: March 31, 2014, 10:25:17 pm
The blog is correct. I don't know where you got that ADC4 is mapped to Arduino Pin 5 and ADC5 is mapped to Pin 6, etc. Refer to http://arduino.cc/en/Hacking/PinMapping2560
In fact, I was able to debug both of my Arduino Mega boards (an old Arduino Mega 1280 and a new Arduino Mega 2560 R3) connecting ADC Pins 4-8 to an AVR Dragon, based on the blog's instructions.
2  Community / Products and Services / Re: Wrobot / Emartee / Ywrobot relay board... on: June 08, 2012, 12:34:26 pm
This is just a follow-up. I could not try those other solutions because I only have one power supply available and everything was already fully wired up. However, I got a new relay board, the one that is on your picture, and it works perfectly well. So it's all good now!
3  Community / Products and Services / Re: Wrobot / Emartee / Ywrobot relay board... on: May 28, 2012, 02:24:24 pm
Thank you for your detailed response. It looks like I will have to replace my relay board with one with optical isolation. I hoped I could avoid that because it is already built into a custom box. Ah, well...
4  Community / Products and Services / Re: Wrobot / Emartee / Ywrobot relay board... on: May 26, 2012, 08:48:15 pm
I have this Ywrobot Relay board. I've built a remotely controlled power outlet with it. It works perfectly well when nothing is plugged into the outlets. However, when I plug a lamp or anything into the outlet and switch the relay, Arduino frequently locks up.  I guess this board doesn't do a great job of de-coupling the power supply. Any idea how I could improve it? Adding a capacitor or an inductor to the board perhaps?

Here is the circuit of this relay board:


And here is a link with some additional pictures: http://www.ebay.com/itm/Two-2-Channel-5V-Relay-Module-Expansion-Board-For-Arduino-ARM-PIC-AVR-MCU-DSP-/221009967173?pt=LH_DefaultDomain_0&hash=item3375387845.
5  Forum 2005-2010 (read only) / Interfacing / Re: Graphic LCD (KS0108) library now available on: November 19, 2008, 01:03:00 pm
Thanks for your reply, Frisken! I can only measure 0.5V on pin 18. I guess that is why I can't see anything on the screen. It seems I got a faulty unit or I killed it somehow.  smiley-sad
6  Forum 2005-2010 (read only) / Interfacing / Re: Graphic LCD (KS0108) library now available on: November 18, 2008, 01:31:32 am
Hello there,

I bought Futurlec BLUE128X64LCD LCD (type B pinout), but I cannot make it work with my Arduino. The backlight is lit up, but there is nothing on the screen. I also cannot adjust the contrast. I've noticed on the Wiki page that the the third leg of the contrast potmeter is connected to the ground. According to the datasheet of Lumex LCM-S12864GSF (another LCD with type B pinout), it should be connected to 5V. Well, I tried in both way (which I probably shouldn't have) but it didn't work anyway. How much voltage should actually be present at pin 18 (Vee)?

Thanks!
Pages: [1]