The one with 33V connected to the resistor is a pull-up resistor. Adafruit Industries Unique fun DIY electronics and kits.
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. Meanwhile pull-down resistors pull voltage down by having a GND pin connected to them. Figure 2 shows the response of a NTC thermistor between -40C and 60C. Pushbuttons use two kinds of resistors.
If you have a really fast changing signal like USB a high value pull-up resistor can limit the speed at which the pin can reliably change state. Breadboard 170 points 19 x 13 WBP-317. From the figure you can see that thermistors have high sensitivity.
You can still use a pushbutton without a resistor but doing that leaves your GPIO pin on float. Thermistor resistance changes with temperature. It pulls the voltage upward.
LEDs - Tools Gift Certificates Arduino Cables Sensors LEDs Books Breakout Boards Power EL WireTapePanel Components Parts LCDs Displays Wearables Prototyping Raspberry Pi Wireless Young Engineers 3D printing NeoPixels Kits Projects Robotics CNC Accessories CosplayCostuming Halloween Reseller. All of these factors play. This is why you will often see 1k to 47KΩ resistors on USB signal lines.
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