Raspberry Pi MMA8452Q 3-Axis 12-ntsis/8-ntsis Digital Accelerometer Python Qhia: 4 Kauj Ruam

2024 Tus sau: John Day | [email protected]. Kawg hloov kho: 2024-01-30 09:25

MMA8452Q yog lub ntse, lub zog qis, peb-axis, muaj peev xwm, lub tshuab ntsuas hluav taws xob micromachined nrog 12 qhov kev daws teeb meem. Cov neeg siv hloov pauv tau cov kev xaiv ua haujlwm tau muab nrog kev pab cuam ntawm lub zog ua haujlwm hauv lub nrawm, teeb tsa tau rau ob qho cuam tshuam tus pin. Nws muaj cov neeg siv xaiv tau cov nplai ntawm g 2g/± 4g/± 8g nrog cov qib siab lim lim cov ntaub ntawv nrog rau cov ntaub ntawv tsis lim dej muaj lub sijhawm tiag. Nov yog nws qhov ua piv txwv nrog raspberry pi siv tus lej nab npawb.

Kauj Ruam 1: Yam Koj Xav Tau..

1. Raspberry Pi

2. MMA8452Q

3. I²C Cable

4. I²C Shield rau Raspberry Pi

5. Ethernet Cable

Kauj Ruam 2: Kev Sib Txuas:

Siv daim I2C daim thaiv rau raspberry pi thiab maj mam thawb nws hla gpio pins ntawm raspberry pi.

Tom qab ntawd txuas ib kawg ntawm I2C cable rau MMA8452Q sensor thiab lwm qhov kawg rau I2C daim ntaub thaiv.

Kuj txuas Ethernet cable rau pi lossis koj tuaj yeem siv WiFi module.

Kev sib txuas tau qhia hauv daim duab saum toj no.

Kauj ruam 3: Code:

Tus nab npawb nab npawb rau MMA8452Q tuaj yeem rub tawm los ntawm peb qhov chaw cia khoom github- Tswj Txhua Yam Hauv Lub Zos

Nov yog qhov txuas.

Peb tau siv SMBus lub tsev qiv ntawv rau sej code, cov kauj ruam rau nruab SMBus ntawm raspberry pi tau piav qhia ntawm no:

pypi.python.org/pypi/smbus-cffi/0.5.1

Koj tseem tuaj yeem luam cov cai los ntawm no, nws tau muab raws li hauv qab no:

# Faib nrog daim ntawv tso cai yuav dawb.

# Siv nws txhua txoj hauv kev uas koj xav tau, muaj txiaj ntsig lossis pub dawb, muab nws haum rau hauv daim ntawv tso cai ntawm nws cov haujlwm sib txuam.

# MMA8452Q

# Txoj cai no yog tsim los ua haujlwm nrog MMA8452Q_I2CS I2C Mini Module.

ntshuam smbus

lub sij hawm ntshuam

# Tau I2C npav

npav = smbus. SMBus (1)

# MMA8452Q chaw nyob, 0x1C (28)

# Xaiv Tswj npe, 0x2A (42)

# 0x00 (00) StandBy hom

bus.write_byte_data (0x1C, 0x2A, 0x00)

# MMA8452Q chaw nyob, 0x1C (28)

# Xaiv Tswj npe, 0x2A (42)

# 0x01 (01) Hom nquag

bus.write_byte_data (0x1C, 0x2A, 0x01)

# MMA8452Q chaw nyob, 0x1C (28)

# Xaiv Configuration register, 0x0E (14)

# 0x00 (00) Teeb ntau yam rau +/- 2g

bus.write_byte_data (0x1C, 0x0E, 0x00)

sijhawm.s pw (0.5)

# MMA8452Q chaw nyob, 0x1C (28)

# Nyeem cov ntaub ntawv rov qab los ntawm 0x00 (0), 7 bytes

# Cov xwm txheej sau npe, X-Axis MSB, X-Axis LSB, Y-Axis MSB, Y-Axis LSB, Z-Axis MSB, Z-Axis LSB

cov ntaub ntawv = bus.read_i2c_block_data (0x1C, 0x00, 7)

# Hloov cov ntaub ntawv

xAccl = (data [1] * 256 + data [2]) / 16

yog xAccl> 2047:

xwm -4096

yAccl = (data [3] * 256 + data [4]) / 16

Yog tias yAccl> 2047:

yAccl -= 4096 z

Accl = (cov ntaub ntawv [5] * 256 + cov ntaub ntawv [6]) / 16

yog zAccl> 2047:

txz -4096

# Cov ntaub ntawv tso tawm rau lub vijtsam

luam "Kev nrawm hauv X-Axis: %d" %xAccl

luam "Kev nrawm hauv Y-Axis: %d" %yAccl

luam "Kev nrawm hauv Z-Axis: %d" %zAccl

Kauj Ruam 4: Cov ntawv thov:

MMA8452Q muaj ntau daim ntawv thov suav nrog E-Compass applications, Static orientation detection uas koom nrog Portrait/Landscape, Up/Down, Left/Right, Back/Front position identification, Notebook, e-reader, and Laptop Tumble and Freefall Detection, Real-time kev txheeb xyuas kev taw qhia suav nrog kev muaj tiag virtual thiab kev ua si 3D cov neeg siv txoj haujlwm tawm tswv yim, Kev tshuaj xyuas lub sijhawm tiag tiag xws li kev ntsuas tus lej ntsuas, ntsuas kev poob qis rau HDD, tuag-suav nrog GPS thaub qab thiab ntau ntxiv.