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--- user:kluong:low_power_design_considerations [2020/04/28 03:24]
kluong
+++ user:kluong:low_power_design_considerations [2021/09/19 21:59] (current)
@@ Line 3: / Line 3: @@
 **Low power design considerations**
-  * Previous designs are pretty inefficient - lets take a look at why (the design choices are different for each hardware platform)
+I started this writeup after I was doing some reading about low-power arduino setups.
+  * Previous designs are pretty inefficient - lets take a look at how inefficient, why and what we can do to design a better power system in the future. First we need to take a look at some of the constraints that we're dealing with:
+    * Rooftop; no place to plug in
+    * Hypothetical design consideration: raspberry pi - is it possible?
+      * About 1A / 5V -> 5W
+      * 6W solar panel charger not enough to charge during the day
+      * 10W solar panel might be enough: https://www.adafruit.com/product/2747
+      * Cost consideration
+        * Driving down power consumption means cheaper solar panel and cheaper battery
+  * The design choices are different for each hardware platform - this is not a critique on the designers / people
     * Apple
     * Cranberry
@@ Line 12: / Line 22: @@
   * XBee power states (sleep mode)
   * Microcontroller sleep modes
-  * Other sensors
+  * Sensors - how much power do they consume?
-  * How low can we go?
+  * How low can we go? (Theoretical)
 Footnotes:
@@ Line 23: / Line 34: @@
   * https://lowpowerlab.com/shop/index.php?_route_=Moteino/moteino-r4
   * https://www.rocketscream.com/blog/product/mini-ultra-8-mhz-arduino-compatible/
+  * https://learn.sparkfun.com/tutorials/reducing-arduino-power-consumption/all
+====== Example main ======
+Using the low power library, here is what the loop function looks like:
+<code>
+    sleep_counter++;
+    LowPower.idle(SLEEP_4S, ADC_OFF, TIMER2_OFF, TIMER1_OFF, TIMER0_OFF,
+        SPI_OFF, USART0_OFF, TWI_OFF);
+    if(sleep_counter % 15 == 0){
+        board.sample(&board);
+    }
+</code>