Design an ULTRA LOW POWER TIMER
Budget: $30 – $250 AUD
Design a Power Board capable of powering a https://www.lilygo.cc/products/a-t-pcie?variant=42335921832117 with a https://www.lilygo.cc/products/a-t-pcie?variant=43092519125173 attached for 10 years using 4 AA or C Cell alkaline batterys
The ESP32 will only be active once or twice each month for 10 mins at time so the overall 'ontime' over 10 years is 2400 Minutes or 240 'runs'.
The board will be designed on PCBWAY or something similar and the actual board with all components on it will be shipped to me. The board cost is not part of the project, however, you have to setup PCBWay with the design and all the components.
To solve the issue of the ESP32 going into runaway mode (where it doesn't ever stop), the device will need to kill the power to the ESP32 after it's been running for more than 20 mins and include a done pin so the ESP32 can tell the device it's done it's job and to drop the power and reset the timer.
To make the board usable for other projects, it should have 2 bitswitchs on it that control the first timer in lots of hours and the second timer in lots of minutes like https://core-electronics.com.au/guides/makerverse-nano-power-timer/.
The board will be connected to the 4 Alkaline Batterys, and then every 'N' Hours (where N could be 10,000), convert the power to 3.3V, start the powercheck timer and complete the circuit to the ESP32. If the ESP32 sets the done pin, the device drops power, and resets the first timer. If the 'powercheck' timer goes off, the device drops power and resets the first timer.
It is important to note that when the first timer is running, the power draw needs to be less than 50na so that the device can last for over 100 years in the field if the timer only goes off once per year.
The ESP32 will only be active once or twice each month for 10 mins at time so the overall 'ontime' over 10 years is 2400 Minutes or 240 'runs'.
The board will be designed on PCBWAY or something similar and the actual board with all components on it will be shipped to me. The board cost is not part of the project, however, you have to setup PCBWay with the design and all the components.
To solve the issue of the ESP32 going into runaway mode (where it doesn't ever stop), the device will need to kill the power to the ESP32 after it's been running for more than 20 mins and include a done pin so the ESP32 can tell the device it's done it's job and to drop the power and reset the timer.
To make the board usable for other projects, it should have 2 bitswitchs on it that control the first timer in lots of hours and the second timer in lots of minutes like https://core-electronics.com.au/guides/makerverse-nano-power-timer/.
The board will be connected to the 4 Alkaline Batterys, and then every 'N' Hours (where N could be 10,000), convert the power to 3.3V, start the powercheck timer and complete the circuit to the ESP32. If the ESP32 sets the done pin, the device drops power, and resets the first timer. If the 'powercheck' timer goes off, the device drops power and resets the first timer.
It is important to note that when the first timer is running, the power draw needs to be less than 50na so that the device can last for over 100 years in the field if the timer only goes off once per year.