Search found 778 matches

by Roberthh
Tue Oct 24, 2017 4:00 pm
Forum: The MicroPython pyboard
Topic: REPL Pyboard over serial not USB
Replies: 8
Views: 358

Re: REPL Pyboard over serial not USB

That's possible. Look in the manual for uos.dupterm().http://docs.micropython.org/en/latest/p ... os.dupterm
by Roberthh
Tue Oct 24, 2017 3:57 pm
Forum: Development of MicroPython
Topic: [SOLVED]memzip vs frozen - what's the difference?
Replies: 4
Views: 245

Re: memzip vs frozen - what's the difference?

If available use frozen bytecode. It uses less RAM and starts faster, because it is already compiled.
by Roberthh
Tue Oct 24, 2017 5:14 am
Forum: General Discussion and Questions
Topic: FrameBuffer Custom Symbol
Replies: 3
Views: 174

Re: FrameBuffer Custom Symbol

@pythoncoder has written a library to use arbitrary fonts. You'll find it in this forum. I assume he will give you a hint, once he reads this post. But just to add one character, this may be a little overdone.
by Roberthh
Thu Oct 19, 2017 8:10 pm
Forum: ESP8266 boards
Topic: Is the SPI flash module's CS pin exposed on ESP-12E module?
Replies: 11
Views: 417

Re: Is the SPI flash module's CS pin exposed on ESP-12E module?

Use GPIO13 for MOSI, GPIO12 for MISO, GPIO14 for CLK and GPIO 2, 4 or 5 for CS. Since GPIO4 and 5 are typically used for I2C, you may choose GPIO2. GPIO2 is also used for boot control, so it must not be pulled low during boot. But using it as an output isOK.
by Roberthh
Thu Oct 19, 2017 7:20 pm
Forum: ESP8266 boards
Topic: MicroPython's I2C and SPI support
Replies: 12
Views: 457

Re: MicroPython's I2C and SPI support

You rtc device may also work with 3.3v. If you have a product link, I could look at it.
by Roberthh
Thu Oct 19, 2017 3:33 pm
Forum: ESP8266 boards
Topic: MicroPython's I2C and SPI support
Replies: 12
Views: 457

Re: MicroPython's I2C and SPI support, 5V Tolerant or not

This is a link to the related question on the espressif web site: http://bbs.espressif.com/viewtopic.php?f=6&t=1145&p=4100&hilit=5V+tolerant#p4100 It clearly states (in 2015) that the device is NOT 5V tolerant. If you limit the current into the input, e.g. by a sufficient large resistor, the ESD cla...
by Roberthh
Thu Oct 19, 2017 3:27 pm
Forum: ESP8266 boards
Topic: Is the SPI flash module's CS pin exposed on ESP-12E module?
Replies: 11
Views: 417

Re: Is the SPI flash module's CS pin exposed on ESP-12E module?

Any GPIO which is not used otherwise. The ESP-12E seems to expose CS of the internal flash on the small edge, labeleld CS. So do not use that one.
by Roberthh
Thu Oct 19, 2017 10:48 am
Forum: Drivers for External Components
Topic: Using the ESP with a Ethernet Port through SPI
Replies: 7
Views: 443

Re: Using the ESP with a Ethernet Port through SPI

I tested such a unit yesterday with a Pyboard, and it works well. I have serious doubts that this driver is intended to work with the ESP8266 port. The Makefile has no notice of it, and neither the network module. It may possible to fit it in, but I would be very suprised if just pulling in the file...
by Roberthh
Thu Oct 19, 2017 6:54 am
Forum: ESP8266 boards
Topic: Is the SPI flash module's CS pin exposed on ESP-12E module?
Replies: 11
Views: 417

Re: Is the SPI flash module's CS pin exposed on ESP-12E module?

You can use any GPIO pin as CS. There is a SD card adapter board from Wemos, which cost about 1 $ and works nice.
by Roberthh
Thu Oct 19, 2017 6:50 am
Forum: ESP8266 boards
Topic: MicroPython's I2C and SPI support
Replies: 12
Views: 457

Re: MicroPython's I2C and SPI support

Do I also have to connect pullups to 3.3V or are they typically included on these WeMos or NODEMCU etc. boards? Yes, you have to use pull-up resistors, and no, the are not such ones on the Wemos or NODEMCU devices, simply because GPIOs are general purpose. You may be able to run your external devic...