Hi everyone.
I use arduino mega 2560 this 2.4" tft lcd
http://www.ebay.com/itm/271440270917?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
with adafruit library(modified for mega) an it works well as display and touch.
I added a 8 channels relay shield.(2 model , the same thing)
-
http://www.ebay.com/itm/5V-8-Channel-Electronic-Relay-Module-for-Arduino-PIC-PLC-AVR-MCU-DSP-ARM-/111072534778?pt=LH_DefaultDomain_0&hash=item19dc7060fa
2.http://www.ebay.com/itm/8-Channel-5V-Relay-Module-Shield-For-Arduino-Uno-Meage-2560-1280-ARM-AVR-PIC-DSP-/191101870134?pt=LH_DefaultDomain_2&hash=item2c7e8f2036
First i use power for 8 relay shield directly from 5v pin of arduino.
I opened 3 relay.All was ok.I opened 4 relay.In this moment tft had low ilumination , display all text ok , but touch screen responds very very hard.
I understand in that moment the power consumption for 8 channel shield is too much for arduino.
After this i change the power source for 8 relay shield from an external 5v source (and put the gnd to the arduino gnd) but in the same socket with arduino power source.I have the same problem, touch works very very hard , bug delay.
I tried to charge arduino and 8 relay shield from the same power source , 5v 2A usb but the same thing.
The touch works only if 8 relay shield is power off or , if i use an external power source 5v for ipad (maybe it has a protection) , if i use an external power source for 8 relay chanel like next items , touch respond very very hard. - http://www.ebay.com/itm/EU-Plug-1A-5V-USB-Wall-Charger-Adapter-For-iPhone-4-4S-5G-5S-5C-iPod-Touch-Nano-/201082436754?pt=US_Cell_Phone_PDA_Chargers&hash=item2ed1727c92
- http://www.ebay.com/itm/291093458324?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
Anybody can help me with some advice?
Many many Thanks to all.