Search the Community
Showing results for tags 'low-power'.
Found 2 results
-
For those that don't follow the 43oh Blog: @@Fmilburn published a great write-up about how to use EnergyTrace to measure and improve power consumption and battery life of an Energia sketch. The article includes a nice demonstration of the effectiveness of sleep() vs. delay(). http://43oh.com/2015/09/how-to-measure-an-energia-applications-power-usage-with-energytrace/ He also shows how an EnergyTrace compatible LaunchPad (e.g. FR5969) can be used to measure power consumption of an older LaunchPad (e.g. G2553). This probably works for standalone projects as well.
- 6 replies
-
- 5
-
-
- energytrace
- low-power
- (and 1 more)
-
Finally I'll share some of my binary watch project with you guys. Some features: - 11 LEDs charlieplexed on 2x 3 I/O pins (6 LEDs per 3 I/O lines, one LED not placed) - As low power as can get (900 nA in stand-by) - 14-pin value lin MSP430 - watch crystal sourced (32768Hz) - two buttons (of which one is on the reset line) - well under 2kB code (1.6kB) The "display refresh rate" is 512Hz, which makes the "pixel refresh rate" at 85Hz, a comfortable rate for the eye. The WDT is used as a minute timer (2 second hardware, 30 iterations in software), sourced from the crystal, I go down to LPM3 then and can run at 900 nanoAmps. During display I run in LPM1 from which I wake 512 times per second to update the LED display. The reset line is reused as an input line for one of my two buttons, using the NMI I can use it as a reliable button input pin using some nifty software tricks. I use the reset line as button input because I ran out of I/O (10 available: 6 for the display, 1 for a button, 2 for the crystal and 1 for a future buzzer) I'm busy desiging a PCB for this too (not a booster, a feature complete board). Using a coincell/buttoncell battery I can fit all my components (except the battery and buzzer) on a 11x39mm PCB, targeting for 20x20mm now.
- 7 replies
-
- 3
-
-
- binay watch
- low-power
- (and 1 more)
