Current fall latency
I’ve been fighting with instabilities in the MPPT algorithm for some time, and I’ve nailed it to the behavior of the system when the speed […]
Make
Almabraxas 3-1: power management strategy
How do you manage power on a battery-less, solar-powered autonomous (ro-)boat ? Well, the power management part of the prototype is done and working for […]
MBED, FlashIAP, TDBStore and STM32F4 internal flash
(Also: deriving your own class from SlicingBlockDevice) It wasn’t completely trivial to have all of them work together. Either the documentation doesn’t dig deep enough […]
The UVLO is here
You might remember that part of the power control strategy is to use a UVLO (under voltage lock-out). Well, here it is. It’s a simple […]
More on noise in current measurement (actually less noise)
I’ve increased the sampling frequency to 23kHz and got much more stable results, stable enough to be useful. The image here shows the current measured […]
Frame before cutting
It’s a 3mm Perspex sheet. I was a bit suprised how flexible it is, I was expecting more rigidity. But it’s okay, I will (try […]
Dual motor now working
Still Spider ESC for the left motor, Blue Robotics basic ESC for the right motor. For some reason, I was unable to make PWM work […]
1st shot at a remote console for the prototype boat
Built with wxPython. Communicate through the serial port of the PC with a Teensy making the gateway with the RFM69 radio module (and from here […]
ACS 713 / 723 current sensor experiment
In spite of some efforts, it’s still difficult to get a stable current measurement. As a reminder, on the prototype, the power is 25W with […]
New prototype motor voltage strategy
As a reminder, the point is that the solar panel gives ~ 22V, while the motors are rated 14.4V. I thought a lot about it, […]