OUTPUT_OPEN_DRAIN_PULL_UP, /* Output, actively driven low. When set high, is pulled high with an internal resistor */ OUTPUT_OPEN_DRAIN_NO_PULL, /* Output, actively driven low. When set high, is high-impedance */ INPUT_PULL_DOWN, /* Input, with an internal pull-down resistor */ ...
the URXD1 pin on my board measures only 12~13 Ohms to ground (no matter which polarity the meter is connected). That is much too low for a pull-down resistor (and is probably the reason that the CPU chip is much warmer
I made a simple wire with a resistor on it (the 1k, that might need to be just a tiny bit larger, but for now it works). I connected one side to +3V3, the other side to alternatingly RXD and TXD. Also I disabled the internal pull-ups.Once again, it shows that connection speed...
GPIO2 should always use a pullup resistor to VCC, not a direct connection. This is because it is configured as an output by the boot ROM. If GPIO15 is unused then it can be connected directly to ground, but it's safest to use a pulldown resistor here as well. Selecting bootloader m...
Choosing a pull down resistor for an LDR: The Axel Benz Formula Breadboard PSU Switching low voltage AC with a microcontroller Versatile microcontroller PSU RTC with EEPROM Cheap PIR hack PowerLED drivers A Tachometer Opamp to irrigate your Garden (newer, better) ...
There is a workaround you can do, where you connect one side of the switch to D3 or D4 (with a pull up resistor) then connect the other side of the switch to a third GPIO (instead of connecting to ground).On startup the third GPIO will act as an input with high impedance so ...
The nice thing aboutESP-12S moduleas compare to ESP-12E/F or older ESP-12 is that all the pull-up/pull-down resistors, decoupling capacitors are built-in, making it quite neat with minimum external components required. The only two components that I add is a diode connecting between GPIO...
GPIO2 should always use a pullup resistor to VCC, not a direct connection. This is because it is configured as an output by the boot ROM. If GPIO15 is unused then it can be connected directly to ground, but it's safest to use a pulldown resistor here as well. Selecting bootloader ...
is pulled high with an internal resistor */OUTPUT_OPEN_DRAIN_NO_PULL,/* Output, actively driven low. When set high, is high-impedance */INPUT_PULL_DOWN,/* Input, with an internal pull-down resistor */INPUT_PULL_UP,/* Input, with an internal pull-up resistor */INPUT_HIGH_IMPEDANCE,/...
self.res = pyb.Pin(pinout['res'], pyb.Pin.OUT_PP, pyb.Pin.PULL_DOWN) self.offset = 0 else: # Infer bus number from pin if pinout['sda'] == 'X10': self.i2c = pyb.I2C(1) else: self.i2c = pyb.I2C(2) self.i2c.init(pyb.I2C.MASTER, baudrate=400000) # 400kHz self.devid...