Hi again, Andoni here with the same problem this time in another LCD (this one is not from DX, the teacher gave it me after burning 2 , he has used them in a lot of different projects and they work well).
First of all i want to say thank you to everybody who has wasted time in helping, this is my fist DIY proyect, so I'm not any expert but i like this world. I'm doing as final project a Greenhause controlled by arduino (duemilanove), I bought different sensors like DHT22 (temperature and humidity, digital), ambient light sensor, Soil moisture sensor, pH sensor...I need the LCD because I want to make manual and automatic control, and with the help of some Informatic friends control through Internet also.
About your posts, MAS3 I don't put the shield over the arduino because I change the inputs every day as well as i improve the different parts of the proyect. I put screws in the holes of the green PCB because space problems. After having some problems with sensors (concretly the DHT22 measures always 1% humidity....... ) , i decide to make a simulated inputs board to analyze better the program under different conditions. After burning the second LCD I replace it for a better one but without buttons, so i get the schematic and build a new one as you can see in the photo.
Floresta I'm not really sure but i know that the 3 different LCD i used before worked properly until they crash, so i think the connections and the initialization or commands are OK. Mlowther be sure that when i have time i'll try to open and clean them carefully... ;)
I'm seriously thinking now about the power supply. I use a variable one from 0-25V that we made in class after buying the components. It is in the second photo. Every time i connect it to my board I ensure with a polymeter that the voltage is 5V. It has got two control, and with the most sensitive is easy to put it in 5.00V. I analyzed the signal with the teacher and he told me it is really strong and reliable. But what about the starting peak??do you know if it could be enought to burn 3 of them?? I don't make any measurements of this magnitude.
Thanks in advanced. I'll be waiting your answers.
i have some problems with the photos.....i think they are too big!