TPL5110 & P-Channel MOSFET on @sparkfun SOIC to DIP 8-Pin Adapter = DIY Timer | via @PublicLab
This is a neat challenge from Public Lab user cfastie who made this cute low-power timer for data-logging projects, mounting a DIP6 IC on a DIP8 adapter, using the other adapter pads for additional connections – neat! They even mention our own TPL5110 breakout for comparison; the adapter used is already quite smaller than our own breakout size (with a few fewer features sacrificed) and they conclude they could further minify their own design using smaller resistor/s than those shown above.
Adding a low power timer to a data logger has great promise as an easy way to extend the time the logger can operate on small batteries. Rough calculations suggest that a few AA batteries can power an Arduino-based logger for a year or more when a TLP5110 timer controls the current flowing to the logger.
The Adafruit Low Power Logger costs $4.95 (plus shipping) which adds a substantial proportion to the cost of a DIY Arduino-based data logger. So I investigated making my own timer using the same components. The only components needed are the TPL5110 timer IC, a mosfet, and a resistor. Not including shipping, these cost $1.25 per set if you buy 10 of each. So I did.
One of my DIY timers was controlling a Mini Pearl Logger in my freezer the other day. A 61.9kΩ resistor set the logging interval at 12 minutes. The graph includes 10 hours of data. My freezer temperature varies a lot more than I thought it would.
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.