Forum Hardware Main board Details about Ferduino Mega 2560

Details about Ferduino Mega 2560


Post Number:#1 Post Sun Aug 17, 2014 2:05 pm
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General details:


See here the pin map of the board.

See here the name of the components

Image


A - On connector is available the pin 1.
The pin 1 (TX) is used to serial communication, so remove any cable connected on this connector before of try send a code to the board.
To use the pin 1 as output remove all Serial.begin() of your code.

B - This jumpers are used to select pins for RTC.
To use the pins 18 and 19 put the jumper in the position 1-2.
To use the pins 20 and 21 put the jumper in the position 2-3.
Remember that to use Henning's library mandatorily the pins should be 18 and 19 therefore, position 1-2. No forget to set it on code.

C - This LED's are connected to pins 16 and 17 and in parallel with the multiplexer. This LED's allow see which channel is opened on multiplexer.

D - This trimmer allow control the volume of the buzzer.

E - This connector is connected to pin 0 and in parallel with the buzzer. Allow connect a small LED to be used as visual alarm.
The pin 0 (RX) is used to serial communication, so remove any cable connected on this connector before of try send a code to the board.
To use the pin 0 as output remove all Serial.begin() of your code.

F - This jumper allow disable the buzzer.
Remove this jumper before of try send a code to the board.

G - This trimmer allow control the brightness of the TFT.
Before of connect your TFT without a flat cable, check if have approximately 3.25 V on pin 19 shown in the image above. Otherwise adjust the trimmer.

H - Connect a small wire (antenna) on this place to use the module RF, following the length below.
1/4 wave = 77.9mm
1/2 wave = 155.9mm
Full wave = 327.8mm


Specific details:


By default the signal available on connector DB25 and controlled by PCF8575 is of 0 Volt, see a generic schematic below.

Image


If you need of a signal of 5V, you can remove the ULN2803 and make bridges like this:

Image


Check the datasheet to see the maximum output current for the PCF8575.

Wiring for dosing pumps:

Image


Table pins:

Image


TFT pinout:

Image


Image


The output in LED_A (backlight) is 0 - 3.3V controled for a trimmer.

TFT 800 x 480:

Warning: I'm not responsible for any problem. You do so at your own risk.


The TFT 800 x 480 have a pinout different as you can see below.

Image


So some changes are needed.

First step:Remove the resistor shown below.

Image


Second step: Make the wiring shown below:

Image


Here the mode as Gianluca did.

Image


Image


More details soon.
Please do not PM me for support unless it is absolutely necessary.

I'll not write custom function to nobody unless you can pay for my job.



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