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Author Topic: Mega2560 + 6 Components. Need tips, experience and suggestions.  (Read 540 times)
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I am new to Arduino. I am trying to build a project using the Mega2560 connected to a: 433MHz RF transmitter and receiver, SD Card MP3 Sound Module, Digital Pressure Sensor, 3.2" TFT LCD Display+Touch Panel, CO Gas Sensor, 4-Channel 5V Relay Module, and possibly other components.

The Touch Screen will take up all the digital in/out pins will there be enough pins to incorporate the rest of the components?

Is the 433Hz RF T&R capable of very much traffic?

I figure with enough time and patience i should be able to assemble all of these components into a running machine. Oh course that all depends on whether the Mega can handle all of the components. If you have used any of the components mentions or know someone who has i would greatly appreciate links to code or tips on how to get this project off the ground and running. Below are links to the components i am considering purchasing for this project. 

___Links________________________________
433MHz RF transmitter and receiver:
http://www.ebay.com/itm/261089770447?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

SD Card MP3 Sound Module:
http://www.ebay.com/itm/251109033572?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

Digital Pressure Sensor:
http://www.ebay.com/itm/140778886459?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649#ht_2424wt_1037

3.2" TFT LCD Display+Touch Panel:
http://www.ebay.com/itm/280909341858?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

CO Gas Sensor:
http://www.ebay.com/itm/261090338258?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649#ht_1952wt_1503

4-Channel 5V Relay Module:
http://www.ebay.com/itm/271053549611?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649
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I am new to Arduino. I am trying to build a project using the Mega2560 connected to a: 433MHz RF transmitter and receiver, SD Card MP3 Sound Module, Digital Pressure Sensor, 3.2" TFT LCD Display+Touch Panel, CO Gas Sensor, 4-Channel 5V Relay Module, and possibly other components.

The Touch Screen will take up all the digital in/out pins will there be enough pins to incorporate the rest of the components?

Is the 433Hz RF T&R capable of very much traffic?

I figure with enough time and patience i should be able to assemble all of these components into a running machine. Oh course that all depends on whether the Mega can handle all of the components. If you have used any of the components mentions or know someone who has i would greatly appreciate links to code or tips on how to get this project off the ground and running. Below are links to the components i am considering purchasing for this project. 

___Links________________________________
433MHz RF transmitter and receiver:
http://www.ebay.com/itm/261089770447?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

SD Card MP3 Sound Module:
http://www.ebay.com/itm/251109033572?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

Digital Pressure Sensor:
http://www.ebay.com/itm/140778886459?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649#ht_2424wt_1037

3.2" TFT LCD Display+Touch Panel:
http://www.ebay.com/itm/280909341858?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

CO Gas Sensor:
http://www.ebay.com/itm/261090338258?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649#ht_1952wt_1503

4-Channel 5V Relay Module:
http://www.ebay.com/itm/271053549611?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

That RF unit is pretty slow and prone to interference.  If your interfacing to a PC try Bluetooth the ebay parts are of a similar price.

That LCD is not 5v tolerant you will need at least a pile or resistors and a handful of transistors to connect it.  Preferably a level shifter.

You should have plenty of pins to connect it up the wiring job will be fun your looking at a breadboards worth of interconnects, none of this will just plug into you arduino.
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You can get a 'shield' which allows you to connect the LCD to the Mega. Mine is on order so I can't really add much more. I assume it addresses the voltage issue raised by silasmoekel, but until it arrives I won't be investigating any further!
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Speaking of tolerances. I am wanting to attach this circuit to a run off a car battery. How do i prevent the Amperage of the battery from frying my Mega? Would a level shifter do this?

Can you explain what a level shifter does?
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Speaking of tolerances. I am wanting to attach this circuit to a run off a car battery. How do i prevent the Amperage of the battery from frying my Mega? Would a level shifter do this?

Can you explain what a level shifter does?

Level shifters are for shifting logic levels between two ICs that operate at different voltages on the logic pins (not power pins), i.e. interfacing a 3.3V GPS to a 5V Arduino is an example.  What you need for the battery is simply a voltage regulator.  The 7805 is the cheap and standard choice for this, though there are many options out there.  

You can also get a 5V regulator on eBay and many are more efficient than a 7805 or have more capacity.  Search there for a pre-built one.



Output will be held very near +5V on this circuit for a +12V input, it may not be the most efficient option.


* 7805datasheet.gif (5.73 KB, 600x281 - viewed 69 times.)
« Last Edit: September 13, 2012, 05:43:01 pm by JoeN » Logged

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Would i need more then one logic shifter for the Mega to communicate with the Screen? If you know of a link that specifies how to incorporate the Screen onto an Arduino (other then a shield) let me know.

Thanks
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