为树莓派爱好者设计的参考尺

电子森林 2020-05-30

小小的一把尺子,几乎是每个工程师桌上必备,因此很多厂商打起了这方面的主意,比如Adafruit做的这把尺子:

还有这个用于体验CircuitPython的称之为PyRuler的尺子,直接把电路做在了尺子上:

它的功能:

  • ATSAMD21E18 32-bit Cortex M0+ - 256KB Flash, 32 KB RAM, 48 MHz 32 bit processor

  • Native USB supported by every OS - can be used in Arduino or CircuitPython as USB serial console, Keyboard/Mouse HID, even a little disk drive for storing Python scripts.

  • Can be used with the Arduino IDE or CircuitPython

  • Four capacitive touch pads.

  • Lots of LEDS - Built in green ON LED, red pin #13 LED, RGB DotStar LED, plus red/yellow/green/blue matching LEDs for each capacitive touch pad

  • 5 GPIO header pins are available and are not shared with USB or the touch pads/LEDs - so you can use them for whatever you like! Digital I/O with pullup/down. 3 ADCs, 1 DAC, 2 PWM, 3 extra captouch sensors

  • Can drive NeoPixels or DotStars on any pins, with enough memory to drive 8000+ pixels. DMA-NeoPixel support on one pin so you can drive pixels without having to spend any processor time on it.

  • Native hardware SPI, I2C and Serial available on two pads so you can connect to any I2C or Serial device with true hardware support (no annoying bit-banging). You can have either one SPI device or both I2C and Serial.

  • Reset switch for starting your project code over

  • Power with either USB or external output (such as a battery) - it'll automatically switch over


今天我们再来看一把专门给树莓派爱好者设计的尺子,这是在Kickstarter上众筹的一款尺子。:



那么它都有些啥呢:

正面:

  • 15CM, and 6 inch rules with 1mm and 1/16" graduations.

  • Raspberry Pi 4 GPIO pinout with through plated holes.

  • Wire sizes from 10AWG to 28AWG.

  • Circuit board trace widths from 10mils to 80mils, and .25MM to 2MM.

  • Ohm's Law.

背面:

  • Resistor color code.

  • LED package and pinout.

  • Bipolar junction transistor packages and pinouts 

  • Field effect transistor packages and pinouts .

  • Font height in mils and mm. 

  • Formula for resonate frequency.

  • Formulas for capacitive and inductive reactance.

  • USB 2.0 plug pinouts.

  • RJ-45 T-568B pin out.


是不是很有用呢?


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