Khaase

An update: I got the Tag Connect socket and it works fine on my Pololu Atmel ICSP programmer, and using it burning bootloaders and program Mayflys is fast and fun.

I am still sorting through my test results and will probably have to do a new battery of tests with an external datalogger because the internal ADC gets confused by low voltages, but…[Read more]

So far, your super-capacitor idea is holding up pretty well for me. A 100 uF capacitor buffered voltage sag to a degree, but the 10,000 uF supercap (1/10 the voltage rating and 1/2 the size) gets our setup able to use any given battery voltage measurement without having to consider if the sensors are on or not. (I want to write “Battery voltage…[Read more]

I ordered the cable. FWIW The folks that run Tag-Connect are very friendly!

I’ve been testing with Mayfly 1.1 and LiSOCl2 D batteries. Our package is using a Mayfly 1.1, and SD card, and a sensor on the switch power that pulls ~350 mA in pulses when its on.

I initially tried using 1S4P configuration with 95sq015 protection diodes with the intent of preventing heating from cell imbalances. That puts the Vin at about 3.4…[Read more]

Thank you for the link. I was googling for pogo pin grids, what a nifty widget.

I probed the traces to the vertical uSD socket and FTDI and determined that with the isolation capacitor and DTR, it’s not possible to update the bootloader from uSD/J7. Of course, Right there on the circuit diagram there is an ICSP port (H4), which is a set of pads for what I believe are 1.94mm pogo pins by the uSD slot. I wonder if there is a…[Read more]

That is useful, and along the lines of my thinking: moving to LiSOCL2. Though I am having trouble getting supplies to test. The internal impedance of those, especially when low or cold, is a big question. My system can use all the deep-sleep tricks, but when measuring the load spikes up to ~350 mA for fractions of a second, and I wonder if this…[Read more]