![]() ![]() ![]() This is not true for some very simple pin breakout modules - similar to this. If you’re using a pre-made development board or module then the built-in power regulator & capacitors are usually good enough, provided the input power supply is adequate. You also need sufficient capacitance on the power circuit to meet large spikes of power demand. The 3.3V power supply for the ESP chip has to supply large amounts of current (up to 70mA continuous, 200-300mA peak, might be slightly higher). See the SPI Flash Modes page for a full description of the flash modes and how to determine which ones are supported on your device. Try passing the -fm dio option to write_flash. Writing to flash with qio mode will succeed but the chip can’t read the flash back to run - so nothing happens on boot. Some devices only support the dio flash mode. If esptool can flash your module with write_flash but your program doesn’t run, check the following: Wrong Flash Mode ![]() Power stability problems may also cause this (see Insufficient Power.) Writing to Flash Succeeds but Program Doesn’t Run If flashing fails with random errors part way through, retry with a lower baud rate. Writing to Flash Fails Part Way Through Try using a slower baud rate ( -b 9600 is a very slow value that you can use to verify it’s not a baud rate problem). If you have connected other devices to GPIO pins, try removing them and see if esptool starts working. Check the voltages at each pin with a multimeter, “high” pins should be close to 3.3V and “low” pins should be close to 0V. A common pitfall is leaving a serial terminal accessing this port open in another window and forgetting about it.Ĭheck the chip is receiving 3.3V from a stable power source (see Insufficient Power for more details.)Ĭheck that all pins are connected as described in Boot Mode Selection. If you see errors like “Failed to connect” then your chip is probably not entering the bootloader properly:Ĭheck you are passing the correct serial port on the command line.Ĭheck you have permissions to access the serial port, and other software (such as modem-manager on Linux) is not trying to interact with it. Try the suggestions here if you’re having problems: Bootloader Won’t Respond Pip list displays a list of installed package names and version numbers.Flashing problems can be fiddly to troubleshoot. How to use pip (Install, update, uninstall packages).In some cases, pip is for Python 2, and pip3 is for Python 3.įor basic information on using pip, such as installing, updating, and uninstalling packages, please see the following article. In some environments, use pip3 instead of pip. Run these commands in the command prompt or terminal. If you are using the Python package management system, pip, you can check information about the installed packages using the following commands. Check package version with pip command: pip list, pip freeze, pip show ![]() Modules in the standard library do not have individual versions but follow the Python version. Note that the _version_ attribute is not set for the standard library modules such as math and os. In addition to the _version_ attribute, some packages, such as NumPy and pandas, provide functions and attributes that display more detailed information. Note that not all packages have the _version_ attribute because it is not mandatory. PEP 8 – Style Guide for Python Code |.The _version_ attribute, recommended by Python Enhancement Proposals (PEP), is available in many packages. ![]()
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