Difference between revisions of "AlarmDecoder pHat"

Latest revision as of 22:04, 18 August 2019

AD2pHAT Top

AD2pHAT Bottom

The new AD2pHAT is the latest revision of the AlarmDecoder embedded project. In 2019 it will be replacing the original AD2Pi that was introduced in 2013. The original AD2Pi was designed prior to any standards for add-on boards to the Raspberry Pi. Over the past few years the Pi HAT and pHAT form factor were introduced and many add-on designs have migrated to these layouts. The AD2pHAT is using the the pHAT form factor 30mm x 65mm. This more compact form factor works better with the Pi Zero and still works on the full sized Pi. It is also smaller and closer in size to other micro controllers such as the ESP32Thing that with an adapter^[1] can be used instead of a Pi as the host controller.

The ability to monitor the AD2 Heartbeat signal via GPIO23.
The ability to physically reboot the AD2 embedded device via GPIO18.
i2c 32kbit Serial EEPROM 24AA32AT-I/OT accessible by the embedded host for device tree configuration via GPIO0(SDA0) and GPIO1(SCL0).
Flexible power options.
- Up to 94% high efficiency TRACO Power TSR 1-2450 capable of power a Pi3b+.
- Linear regulators for lower power demands.
  - AZ1117CR-3.3TRG1 for ~200ma continuous load.^[2]
  - LD1117V50 for ~500ma continuous.^[3]

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 * The ability to monitor the AD2 Heartbeat signal via GPIO23.
 * The ability to physically reboot the AD2 embedded device via GPIO18.
-* i2c nvram accessible by the embedded host for device tree configuration.
+* i2c 32kbit Serial EEPROM [https://octopart.com/24aa32at-i%2Fot-microchip-17751700 24AA32AT-I/OT] accessible by the embedded host for device tree configuration via GPIO0(SDA0) and GPIO1(SCL0).
 * Flexible power options.
 ** Up to 94% high efficiency TRACO Power [https://octopart.com/tsr+1-2450-tracopower-10300099 TSR 1-2450] capable of power a Pi3b+.