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 […]
Make
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, […]
RFM69 radio module working (driver needs some polishing) + (1) ESC control ok
Bad luck, I started with a dead ESC (which I was convinced was working), and, since it was my first shot at PWM with ChibiOs, […]
Building a prototype first
I’m restarting the project and building a scaled-down prototype first to solve all the software problem on a cheaper model. I’ve settled on STM32F4(46) for […]
resulting PCB
I added a TMP 36 probe in the process to have the on-board (capsule) temperature, as opposed to the BMP 180 giving the OAT (Outside […]
back to Afro ESC (for 22V operations) + feedback frequency
The basic Afro ESC doesn’t support enough voltage for my needs (the solar panel can deliver as much as 22V). I tried the Spider ESC, […]