数種類の温度センサーを試す | Mbed
氷点下の温度も測りたい場合、LM35DZ は使えません。 そこで、ほかのいくつかの温度センサーを試しました。 まずは 20 ℃くらいの温度でどう計測されるのか確認。 温度比較対象の回路 LM35DZ の出力電圧を NJM2732D で6倍している回路と、その回路での計測値を比較対象として掲載。 計算式(℃) = X * 55.0 = X * 3300 mv / 60 mv * 1℃ 下の図では mbed の P19 と P20 を使うように書いていますが、ほかのセンサーとの兼ね合いで、この試験中は P16 と P17 に 差し替えています。 22時10分までは 0.1 ℃刻み。それ以降は 0.01℃刻みで表示。 23時00分と23時45分付近で温度の山がありますが、これは周囲の温度が変わった影響だと思います。 コンデンサを挿入するなどの作業の時に測定場所（隣の部屋）から自室に持ってきて作業
Raspberry Pi Documentation - Raspberry Pi OS
Raspberry Pi OS is a free operating system based on Debian, optimised for the Raspberry Pi hardware, and is the recommended operating system for normal use on a Raspberry Pi. The OS comes with over 35,000 packages: pre-compiled software bundled in a nice format for easy installation on your Raspberry Pi. Raspberry Pi OS is under active development, with an emphasis on improving the stability and p
Why is the CPU sometimes referred to as BCM2708, sometimes BCM2835?
I've seen the System on Chip of Raspberry Pi referred to usually as "BCM2835" (e.g. on Wikipedia), but sometimes as "BCM2708" (e.g. sources for Linux SPI driver are in bcm2708.c, or in comments to my other question). Which is right, or are both - why? Specially, if there are inconsistencies in datasheets for both, which shall be understood as "more important"?
RPi BCM2835 GPIOs - eLinux.org
Back to RPi_Low-level_peripherals Note: BCM2711 (Raspberry Pi4) has its own page. BCM2835 GPIO functions This is a wiki-fied copy of Table 6-31 from the BCM2835 datasheet including any relevant errata, and additional info from the Compute Module datasheet and raspi-gpio, with a few extra columns, all nicely hyperlinked together and cross-referenced so that clicking on a function name will automati
Benchmarking Raspberry Pi GPIO Speed
Shell script The easiest way to manipulate the Pi GPIO pins is via console. Here’s a simple shell script to toggle the GPIO 4 as fast as possible (add sleep 1 after both to get a nice LED toggle test): #!/bin/sh echo "4" > /sys/class/gpio/export echo "out" > /sys/class/gpio/gpio4/direction while true do echo 1 > /sys/class/gpio/gpio4/value echo 0 > /sys/class/gpio/gpio4/value done As expected, the
GPIO Electrical Specifications, Raspberry Pi Input and Output Pin Voltage and Current Capability
The Raspberry Pi provides general purpose digital input/output pins (called GPIO pins) that you can use for reading digital logic signals or for outputting digital logic levels. The outputs do not have much current capability, but you can drive LEDs or other low current devices. Of course to use them effectively and safely, you need to know their voltage levels and drive capability, and unfortunat
RPi Low-level peripherals - eLinux.org
Back to the Hub Hardware & Peripherals: Hardware - detailed information about the Raspberry Pi boards. Hardware History - guide to the Raspberry Pi models. Low-level Peripherals - using the GPIO and other connectors. Expansion Boards - GPIO plug-in boards providing additional functionality. Screens - attaching a screen to the Raspberry Pi. Cases - lots of nice cases to protect the Raspberry Pi. Ot
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Raspberry Pi Documentation - Configuration