MicroPython Forum (Archive)

Now that is cleaver. where there is a will there is a way.

Mind it does surprise me that on such a simple circuit manufactures can be selling BOBs that don't work

I got an SD card to work using an external adapter in SPI mode. MicroPython ESP32_LoBo_v3.1.24 - 2017-03-16 on ESP32 board with ESP32 Type "help()" for more information. >>> import uos >>> import os >>> uos.sdconfig(uos.SDMODE_SPI, clk=14, mosi=15, miso=2, cs=13) >>> os.mountsd(True) ---------------...

@pythoncoder

Why did you duty = int(10.23 * value) instead of duty = int(value) ??

Edit I already worked it out. Duty isn't in scale of 0 to 100 but rather in 0 to 1023

@laboris I have been using a very similar MP2307 on my robots to step down the 2S 7.2v batteries to 5v for the motors and servos @RobertHH Thanks for the showing me the TPS6306x IC as it a little more solder friendly. It does need a couple of extra resistors to set the adjustable voltage but realist...

In the end I have been using an external counter chip LS7366R as it frees up the MCU with the overheads of counting the encoders especially as my robot has 2 motors with encoders, each encoder has 11 poles with a 31:1 gear box with 4 signals per pole makes 1364 signals to count per revolution per mo...

I haven't used SD card in SPI mode yet. I then ran the ./BUILD.sh flash command, and can now connect to my board using ./BUILD.sh monitor. uos.uname() displays (if that can help) : Hopefully after you ran ./BUILD.sh menuconfig you then ran ./BUILD.sh to build firmware with the options set in menucon...

Ok I am fairly new to harnware but this is my understanding og it, if I am wrong somone will hopefully correct me. Yes the MCP1825 drop out voltage is low at only 210 mV but if your regulating down to 3.3v then the regulator will stop working at 3.3v + 0.21v so round figures 3.5v. The battery will r...

@capstan The LD1117 is nice as a drop in replacement without having to build a new PCB. It will also have the disadvantage of the ineffiency of a linear regulator and the problem of drop out voltage not letting you use all the battery. The lm3281 posted by RobertHH is likely to last 3 times longer t...

@RobertHH Do you know of any IC's that do exacly the same as the LM3281 but in a bigger package. Reading the data sheet the LM3281 sounds perfect for the application of powering a 3.3v dev board except it has 6 pins in a 1.4mm x 1.2mm package. I can successfully solder QNF packages but this looks li...

I too started on ESP8266 but have changed because of the limitations of the ESP8266 (ram and number of I/O pins). I would recomend getting the the ESP32 with both extended SPI flash but also the the extended psRAM. The Wrover modules have the extra psRAM and the Wroom modules you posted doesn't. The...