New module: POT board

[CanadianIceTech]

For the temperature and humidity sensors, what's the accuracy with them? I have a big need for accurate temp and humidity sensors that can transmit data back to a host computer (preferably over wifi), but the temp sensor needs to be a probe that can accurately read ice temperature to 0.1F

I think I found the board you are looking for:
http://wiki.pine64.org/index.php/POT#WiF...PMWF01A.29

And there is a temperature and humidity sensor plugin:
http://wiki.pine64.org/index.php/POT#I2C...PMSDP01.29

However there is no temperature probe or any one that I know of that has a I2C interface. Adafruit sells a temperature probe that is designed to be directly interfaced to a computer that I think has the accuracy you need:
https://www.adafruit.com/products/381

I do not know if it can be interfaced to the WiFi remote board.

I think that is probably what I'm looking for. If I can use a $15 pine64 board in a case that has a large battery (to lengthen times between charging), plus the sensors it'd be far cheaper than what is commercially available. Ideally I'd like to have a wifi receiver on the outside of my office to collect the data from the sensors, then send to a laptop. This will be for monitoring, and also for remote alerts of warm temps caused by a power plant failure so I can try and save the ice while the issue is resolved with the ice plant. (http://www.eyeontheice.com/index.html)

I'm assuming this would be a good humidity sensor? https://www.adafruit.com/products/1293

More detail info and sensor/IC spec for board can be found at,

http://wiki.pine64.org/index.php/POT

For the I2C 4 wire connector, the pin are GND,SDA,SCL and 5V. For the five pin are GND, INTR, SDA, SCL and 5V. For some of the I2C device, they are build in with interrupt. With this interrupt, the CPU will have faster reaction time when certain condition is trigger. This also implied that if the CPU is waiting for the trigger condition, the CPU do not need to scan I2C device thus provide a more efficient use of I2C bus. 6 connectors ( 2pcs five pin and 4pcs of four pin I2C connector) is connect to TWI1-SCL/SDA channel in the pi-2 bus and another 6pcs of the connector is connected to TWI-SCL/SCA channel in the Pi-2 Bus.

All of the INTR pin for the total of 4pcs of connector is connected to separate GPIO of the bus indicating on the PCB.

Both of the I2C channel is going through a I2C Bus Repeater ( PCA9517)  before connecting out to the connector. This will allow the I2C bus to run either in 5V I2C bus or 3.3V I2C bus.

The idea is that you can make use of the PineA64 as sensor Hub and all the sensor is connected to the PineA64 board. For longer distance that which you do not want to pull a long cable, you can make use of the Wifi Remote I2C ( http://wiki.pine64.org/index.php/POT#WiF...PMWF01A.29 ) to use a remote I2C repeater. The I2C connector on the board has the same I2C pin layout configuration. Furthermore, Wifi Remote I2C has a on board relay that allow for 240Vac on/off. the Currently we are still developing the firmware for the Wifi Remote I2C. Once it is ready, we will publish the source for the firmware.

On Humidity and Temperature Sensor, it is base on Silicon Lab Si7021. The sensor IC is mounted on the reverse side of the board. In term of accuracy, it is consider quite good, please refer to  spec the for the detail. The only downside for this IC is that it do not have any address selector and only allow 1 sensor per I2C channel. But if more sensors need to be install, you can make use of the Wifi Remote I2C to allow more Humidity and Temperature Sensor to be installed.

As for the Ambient Light Sensor  it is base on TSL2561T from AMS. The reason for the 5 pin I2C connector is that this sensor allow the CPU to configure a trigger point base on the received light intensity. Once it reaches the level, it will provide a trigger to the CPU.

../KH Goh

Thank you very much for the response. I'm really going to be looking more into this over the coming months and hopefully I can get something going by the next curling season in September.

A bunch of this is still new to me, but I am very interested in exploring this more and learning how to build things like these. The commercially available version of this starts at $5k with very few sensors, so if I can build something like this for about $100 total per sensor (pine64, addon-modules, battery, temp/humidity sensors, etc) that would be preferred.