Hi,
I'm a noob, then that's out of the way.
I'm looking for the SD Card module and I can see that it's a module with 4 pins for data and 2 for power.
But the question I couldn't find any answer on. How do I connect that to the board? Can I use the ICSP pins and still have full functions in all other pins?
I have the Arduino Uno and I'm going to use all the digital pins, so will it be possible to connect the SD card module or will I have to upgrade board to the mega?
When in doubt, check the pinout/schematic:
You might not need a Mega, you can probably save some other pins elsewhere. If you want help with that, you'll have to post more information.
Pieter
PieterP:
When in doubt, check the pinout/schematic:
As you can see, the ICSP pins are the same as digital pins 11, 12 and 13. If you connect an SD card to the ICSP pins, you cannot use digital pins 11, 12 and 13 as normal IO pins (unless you connect another SPI device).You might not need a Mega, you can probably save some other pins elsewhere. If you want help with that, you'll have to post more information.
Pieter
Thanks for the quick answer!
Didn't know that image existed, that's now saved for the future!
I'm going to use the Arduino for some access control so for now, I have 1 reader using 4 pins and 1 antenna using 2 pins for sending and receiving data from a raspberry pi in a closed network.
Later I would possible add another reader or some relays to open/close doors etc.
I can just see that I'm going to run out of those pins quickly.
That just sounds like a project for multiple smaller nodes. Probably makes the design a lot easier 
septillion:
That just sounds like a project for multiple smaller nodes. Probably makes the design a lot easier
We will use multiple arduinos but it just makes sense to have like 1 door being controlled by 1 arduino. Otherwise it can quickly get expensive.
True, but I can't really see how a single door would fill a Mega.
Most readers are on SPI just like a lo of wireless transmitters, couple of lights, door lock. Seems to fit all just fine on a Pro Mini (/ Uno / Nano)
septillion:
True, but I can't really see how a single door would fill a Mega.Most readers are on SPI just like a lo of wireless transmitters, couple of lights, door lock. Seems to fit all just fine on a Pro Mini (/ Uno / Nano)
Maybe you're right. Will of course see it out before I get the Mega.
But the reader is using 4 pins, 2 of those and 8 pins are used, the antenna uses 2 pins and then 10 pins are used, not much room for relays.
I'm not really following you counting...
Reader uses 4, but probably SPI (3 wires SPI, 1 to select reader)
Antenna can't be directly connected to an Arduino so I guess you mean tranceiver. Something like a NRF24L01+ also uses SPI and 2 other lines. Brings total to 6 pins used.
Even when I subtract pins 0 en 1 for serial you're still left with 10! pins for relays and leds and stuff
septillion:
I'm not really following you counting...Reader uses 4, but probably SPI (3 wires SPI, 1 to select reader)
Antenna can't be directly connected to an Arduino so I guess you mean tranceiver. Something like a NRF24L01+ also uses SPI and 2 other lines. Brings total to 6 pins used.
Even when I subtract pins 0 en 1 for serial you're still left with 10! pins for relays and leds and stuff
Sorry for the late answer
It's an RF antenna board that's using 2 pins, tx and rx.
Next up we have 1 reader atm. using 4 pins, tx, rx, LED and a beep sound.
That's 4 pins so far and if we want 1 more reader we're using 4 more pins and then we need one or more relays.
Are you sure the reader and RF module uses serial (that's what Rx and Tx suggest)? Do you have part numbers?
I ask because, especially for readers, SPI is more common.
