12. Output devices¶
General Info¶
Assignment¶
Individual assignment:¶
Note
add an output device to a microcontroller board you’ve designed, and program it to do something
Group assignment:¶
Note
measure the power consumption of an output device
TODO: Individual assignment¶
add an output device to a microcontroller board you’ve designed, and program it to do something
-
Eagle
- Schematic: ERC (Electrical Rule Check)
- Board: DRC (Design Rule Check)
- SMD(Surface Mount Device,表面実装デバイス))
- THT(Through Hole Technology, 挿入実装)
1 2 | |
-
MCU: programmer
- AVR(44,45,85): ISP
- AVR-1(412,1614,3216): UPDI
- SAMD(11C.D,21D.E): JTAG
- ESP(8266,32): Serial(3.3V)
-
SAMD
- Tips List > Burn Bootloader to SAMD11C with Microchip Studio (Windows)
- Seeed Xiao: SAMD21
-
ESP32
- WiFi, Bluetooth
-
Tips List
- Transistor
- Stepper motor
- step response
- LED resistor
TODO: Group assignment¶
measure the power consumption of an output device
-
Ohm’s law
- V = I x R
- Voltage
- Intensity of electricity
- Resistance
- V = I x R
-
P = I x V [W]
-
How to measure V
- multimeter
-
How to measure I
- 直列(series)
- 並列(parallel)
 |
電池の縦棒の長さは電位を表す 長い方が電位が高い=プラス |
 |
電流計は回路に直列につなぐ  なので |
 |
電圧計は回路に並列につなぐ  なので |
 |
回路にあらかめ、電流検出抵抗（Shunt resistance, シャント抵抗）をつなぐ |
 |
シャント抵抗の電圧を計る |
| V=IRより I=V/R | |
| Rb=1[ohm]の場合 Ib = Vb/Rb = Vb[A] | |
| なので I = Ia = Ib |
|
| 直列の場合Ra+Rbが全体の抵抗なので R = Ra + Rb | |
 |
|
| 回路全体の抵抗は シャント抵抗の分だけ増加した Rc = Ra + Rb | |
| シャント抵抗でも電力を消費する Pb = Ib x Vb | |
| シャント抵抗は全体の抵抗の1/1000以下にする | |
| 回路の消費電力は P = I x V - Pb |
- ref. last year
- ref.すっごい大電流からすっごい微小電流までの測り方あれこれ
- ref. Try中２理科 直列回路
- ref. Try中２理科 並列回路
- ref. Try中２理科 オームの法則
Assessment¶
Last update: April 23, 2021