Please let me know the board/display i need to buy to fulfil the following requirements
- I need a 7 inch display where i wish to show some buttons.
- Need PWM so that i can give variable voltage output (0V to 5 V output)
- I will also be using a piezo module, thermometer module and a variable resistor module.
- Cost effective
Please let me know the details so that i can purchase the same.
All you need is here, I recommend FEZ Hydra
http://www.ghielectronics.com/catalog/category/265/
The 7" display will be there in about couple weeks.
Thanks for the speedy reply. I am a .NET Architect. I am new to embedded systems so pardon my ignorance. I have couple more questions
- I guess i will not get a 5V output from any of the Fez boards. Am i right? they are all 3.3 V output. in that case how would i get 5V output?
- which 7 inch display should i use? can i use any 7 inch display? for e.g. there is a 7" tft touch display for $100 from ghi. can i purchase that.
Following i guess are the things i need to order then… I am in india that is the reason i am writing the list of items here. sorry about the list…
- Fez Hydra
- USB Client SP Module
- 7 inch display
Is there anything else i am missing?
Ok I see now. Think if this as building a PC. You need motherboard (mainboard), power supply, and monitor, and maybe sound card
You need FEZ Hydra (mainboard) then you need the better power supply since you will add a large display. In embedded world, a 7" display is considered very large! So go with USB Client DP Module.
You may want to add a Button and LED7R modules to get you started learning. Of course you can pick and choose of any of the other modules, including a 3.5" display available today. If you need sound, add the music module.
As for the 7" display, it is not available today but will be in few weeks.
Thanks a lot.
I already got a fez panda 2 kit and have experimented with it. I was able to do the entire project on that except i had the following issues
- It is a very small screen and does not support bitmap and higher graphics
- did not give me a 5 V output.
What about the 5 Volt output? Any chance i can get around that?
Do you mean 5V power or 5V IO levels? All sockets provide 5V power. If you must have 5V IO levels then you’ll have to use a transistor to amplify the 3V3 signal.
I mean 5 V I/O. I will need to set the voltage output using the touch screen and then the same voltage output power will be used to power a laser for example.
Is there a article or something that tell how to convert the 3.3 to 5 v?
Even if you have 5V out on a processor pin, you can NOT use the processor pin to power relays, laser diode…etc. Processor pins are only to “signal” things and not to “power” things.
You can either use a relay module or use this “load” module http://www.ghielectronics.com/catalog/product/364
Here’s the usual circuit.
Where Vin is your IO and Vout is 5V. Also, you’ll want to add a 10K resistor between Vin & the transistor. The other resistor can be 1K. Vcc is your 5V source.
@ ianlee74 the load module does just that and there is 7 of them
I understand but the load module isn’t yet available. If he wants to go ahead and get something done this will work in the meantime. Besides, everyone needs to learn this
You didn’t indicate what kind of transistor it is, teacher.
Sorry, I usually use 2N2222 or 2N3904.
2N2222 can switch a shocking (hah! see what I did there?) amount of current for such a small, ubiquitous, cheap, easy-to-interface device. If you can’t find them for under $0.10 per, you’re doing it wrong.
I bought a couple hundred off eBay last time for under $0.03 each