Hi majj_11 Thanks, we are pretty pleased with it.
The Carrier board has the following functionality (actually we have 2 types of carrier board, but I’ll stick with the one in the picture for now – the other one has more IO but no MPPT solar)
• IO Expansion – MCP23017T
• 2 Channel ADC – MCP3426
• 1MBIT EEPROM – CAT24M01W1
• Fuel Gauge - MAX17205
• Watchdog Timer – TPL5010) – This can be enabled disabled by a connecter on board, or can be permanently enabled by soldering in a 0R resistor.
• Reset control via a header , we use a reed switch on this so that we don’t need to open the case, this also enables the WDT when the reed switch is installed, so Debug is really easy, simply pull out the plug and WDT is disabled, then plug it back in when deploying it.
• On / Off control via a header, we use a reed switch on this so that we don’t need to open the case.
• Low voltage disconnect / reconnect to ensure that Electron cannot suck the batteries to their death.
• Maximum Power Point tracking solar regulator, with PWM for low light conditions (LT3652)
• Electron Debug UART at TTL levels on Serial5
• 2x Analog Inputs conditioned for 12V
• 2x 12VDC Digital Inputs
• 2x Open Collector Digital Outputs
• Decent size connectors for external wiring.
• Lots of expansion headers to collect any unused IO.
• Dual Batteries for the Solar Charger, these are in series and cell balanced, they provide the necessary inrush requirements to run the Electron without it’s little battery.
• Uses off the shelf 12V Solar Panels.
• Access to connect the Electrons little battery under the board, rather than on to the Electron directly.
• 2x 40pin expansion headers with SPI, I2C, power, batt, GPIO, etc on them (we have Bluetooth, serial, signs, LoRa radio, Spirit Radio, MRF24J40MC radio, ext processor, GPS with SD, inertia etc. Linux processor, and more – not all of them are currently in stock)
• Fullsize (largest) Mikrobus Compatible footprint https://www.mikroe.com/click
• The Electron can be soldered in, with access to the SIM through a slot in the carrier board, it’s a little bit fiddly but perfectly achievable.
• The Taoglas Antenna will stick inside the case no problems.
We also have another PCB that will fit under the carrier board, that has a DC/DC converter on it and is controlled by the Electron, to provide a 12/24V (its adjustable) Output should you need to power an external load from the batteries.