# Raspberry Pi - 2 hats **URL:** \ **Category:** Support\ **Created:** [2 August 2022 12:36 UTC](https://forum.core-electronics.com.au/t/raspberry-pi-2-hats/14731 "2022-08-02T12:36:33Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Glenn208328](https://avatars.discourse-cdn.com/v4/letter/g/4bbf92/32.png) [@Glenn208328](https://forum.core-electronics.com.au/u/Glenn208328)\ **Post date:** [2 August 2022 12:36 UTC](https://forum.core-electronics.com.au/t/raspberry-pi-2-hats/14731/1 "2022-08-02T12:36:33Z")
Hi all Total newby here, what would i need to get a raspberry pi controller to run a 4g hat and a NFC hat at the same time? Cheers Glenn ---
**Author:** ![AndrewBG](https://yyz2.discourse-cdn.com/flex028/user_avatar/forum.core-electronics.com.au/andrewbg/32/6326_2.png) [@AndrewBG](https://forum.core-electronics.com.au/u/AndrewBG)\ **Post date:** [3 August 2022 00:06 UTC](https://forum.core-electronics.com.au/t/raspberry-pi-2-hats/14731/2 "2022-08-03T00:06:24Z")
You only need to make sure that the GPIO pins (other than the bus based pins) are not doubled up on and you can stack as many as you want. ---
**Author:** ![Doug27394](https://yyz2.discourse-cdn.com/flex028/user_avatar/forum.core-electronics.com.au/doug27394/32/7961_2.png) [@Doug27394](https://forum.core-electronics.com.au/u/Doug27394)\ **Post date:** [3 August 2022 01:07 UTC](https://forum.core-electronics.com.au/t/raspberry-pi-2-hats/14731/3 "2022-08-03T01:07:24Z")
> [@Glenn208328](#): > > Total newby here, what would i need to get a raspberry pi controller to run a 4g hat and a NFC hat at the same time? First you need to see if the hats use the same pins, here’s a good place to start [https://pinout.xyz/phatstack](https://pinout.xyz/phatstack) if they both use the I2C pins for I2C [I2C at Raspberry Pi GPIO Pinout](https://pinout.xyz/pinout/i2c) then it’s ok as long as they don’t have the same I2C address ![image](https://canada1.discourse-cdn.com/flex028/uploads/core_electronics/original/2X/2/271bc0b3ca3f24fd76c436dc46bbf0dbdce95e7f.png) Looking at these: - [Waveshare 4G HAT for Raspberry Pi (LTE Cat-4/4G/3G/2G/GNSS) | Core Electronics Australia](https://core-electronics.com.au/waveshare-4g-hat-for-raspberry-pi-lte-cat-4-4g-3g-2g-gnss.html) looks to be set up for stacking, has the documentation for the used pins, but not on pinout.xyz - [SIM7600G-H M.2 4G HAT for Raspberry Pi, LTE CAT4 High Speed, 4G/3G/2G, GNSS, Global Band | Waveshare | Core Electronics Australia](https://core-electronics.com.au/sim7600g-h-m2-4g-hat-for-raspberry-pi-lte-cat4-high-speed-4g3g2g-gnss-global-band-1.html) same as above - [SIM7600G-H 4G HAT (B) for Raspberry Pi, LTE Cat-4 4G / 3G / 2G Support, GNSS Positioning, Global Band | Waveshare | Core Electronics Australia](https://core-electronics.com.au/sim7600g-h-4g-hat-b-for-raspberry-pi-lte-cat-4-4g-3g-2g-support-gnss-positioning-global-band.html) designed for a Pi Zero, soesn’t use the GPIO pins, looks like it mounts under the pi and uses USB, so it’'ll work with any other hat This [NFC HAT for Raspberry Pi (PN532) | Waveshare | Core Electronics Australia](https://core-electronics.com.au/nfc-hat-for-raspberry-pi-pn532.html) looks like it can run off I2C so it _should_ work with the aboce 4G hats (extra documentation [here](https://www.waveshare.com/wiki/PN532_NFC_HAT) ) it’s a pitty Waveshare doesn’t have much on pinout.xyz ☹ Anyway, if you need more clearance for the pins on top of the 4G HAT you could use something like this [Extended GPIO Female Header - 2x20 Pin (13.5mm/9.80mm) | Sparkfun PRT-16764 | Core Electronics Australia](https://core-electronics.com.au/extended-gpio-female-header-2x20-pin-13-5mm-9-80mm.html) ---
**Author:** ![Trent5487676](https://yyz2.discourse-cdn.com/flex028/user_avatar/forum.core-electronics.com.au/trent5487676/32/4583_2.png) [@Trent5487676](https://forum.core-electronics.com.au/u/Trent5487676)\ **Post date:** [3 August 2022 06:13 UTC](https://forum.core-electronics.com.au/t/raspberry-pi-2-hats/14731/4 "2022-08-03T06:13:38Z")
Hi Doug, I’d visited pinout.xyz before but never used the pHAT stack configurator before. What a great tool! While it isn’t a HAT I’d also suggest the [PiicoDev RFID module](https://core-electronics.com.au/piicodev-rfid-module.html) as a potential reader as it uses I2C which is usually the go-to communication protocol for when your Pi is already wearing a HAT/ stacking HATs. ---
**Author:** ![Trent5487676](https://yyz2.discourse-cdn.com/flex028/user_avatar/forum.core-electronics.com.au/trent5487676/32/4583_2.png) [@Trent5487676](https://forum.core-electronics.com.au/u/Trent5487676)\ **Post date:** [4 August 2022 03:00 UTC](https://forum.core-electronics.com.au/t/raspberry-pi-2-hats/14731/5 "2022-08-04T03:00:52Z")
A post was merged into an existing topic: [Waveshare 8202G 5G HAT not working with Pi 4B](https://forum.core-electronics.com.au/t/waveshare-8202g-5g-hat-not-working-with-pi-4b/14736/7) ---
**Author:** ![Glenn208328](https://avatars.discourse-cdn.com/v4/letter/g/4bbf92/32.png) [@Glenn208328](https://forum.core-electronics.com.au/u/Glenn208328)\ **Post date:** [3 August 2022 12:06 UTC](https://forum.core-electronics.com.au/t/raspberry-pi-2-hats/14731/6 "2022-08-03T12:06:50Z")
Thanks, ---
**Author:** ![Glenn208328](https://avatars.discourse-cdn.com/v4/letter/g/4bbf92/32.png) [@Glenn208328](https://forum.core-electronics.com.au/u/Glenn208328)\ **Post date:** [3 August 2022 12:08 UTC](https://forum.core-electronics.com.au/t/raspberry-pi-2-hats/14731/7 "2022-08-03T12:08:00Z")
Thank you so much! I will digest the information and have a crack once im comfortable with what i need…