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https://github.com/maripo/npm-nau7802
NAU7802 A/D converter library for Node.js
https://github.com/maripo/npm-nau7802
Last synced: 15 days ago
JSON representation
NAU7802 A/D converter library for Node.js
- Host: GitHub
- URL: https://github.com/maripo/npm-nau7802
- Owner: maripo
- License: mit
- Created: 2019-04-29T12:40:27.000Z (over 5 years ago)
- Default Branch: master
- Last Pushed: 2020-04-03T15:11:27.000Z (over 4 years ago)
- Last Synced: 2024-10-09T12:36:09.096Z (2 months ago)
- Language: JavaScript
- Size: 4.88 KB
- Stars: 1
- Watchers: 2
- Forks: 0
- Open Issues: 2
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# nau7802
NAU7802 A/D converter library for Node.js
It supports I2C.1 and I2C.2 of Raspberry Pi.
## Installation
```
npm install nau7802
```
## Enable I2C
If it's the first time to use the I2C functionalities of your Raspberry Pi, some steps are needed to enable them.
Run
```
sudo raspi-config
```
on the terminal. It will open the software and hardware config tool. Select **"5 Interfacing Options"** > **"P5 I2C"**, then select *"YES"* to the question "Would you like the ARM I2C interface to be enabled?". After closing the tool by < Finish > button, you are ready to use I2C!
## Example
```
const NAU7802 = require('nau7802');
const adc = new NAU7802(1); // NAU7802 is connected to I2C.1 bus
adc.start();
adc.selectChannel1(); // Select channel
adc.setRate80SPS(); // Sampling rate
adc.startCycle();
setInterval(()=>{
console.log("ADC value=%d", adc.readADCValue());
}, 1000);
```
## API
### constructor (i2cBusNumber)
* i2cBusNumber : Number of I2C bus (1 or 2). If not specified, I2C.1 will be selected.
### start ()
Open I2C, reset all registers and start analog to digital conversion.
### resetResisters ()
Reset all registers of NAU7802.
### calibrate ()
Start calibration and wait until it finishes.
### setRate10SPS ()
Select conversion rate.
### setRate20SPS ()
Select conversion rate.
### setRate40SPS ()
Select conversion rate.
### setRate80SPS ()
Select conversion rate.
### setRate320SPS ()
Select conversion rate. 320SPS is the default value.
### selectChannel1 ()
Select Channel 1 and calibrate.
### selectChannel2 ()
Select Channel 1 and calibrate.
### startCycle ()
Start conversion cycle manually.
### readADCValue ()
Read 24-bit value of A/D conversion result. It returns signed value.
### getRevision ()
Read the revision code.
### setRegValue (regAddress, value)
Set a register's value.
* regAddress : Register address
* value : Byte to write
### readRegValue (regAddress)
Read a register's current value.
* regAddress : Register address
### setRegisterBit (regAddress, bitIndex)
Set a register's single bit to 1.
* regAddress : Register address
* index : Bit index
### setRegisterBit (regAddress, bitIndex)
Clear a register's single bit to 0.
* regAddress : Register address
* index : Bit index
### waitForBitValue (regAddress, bitIndex, bitValue, timeoutMsec)
Wait until the specified bit value become true or false.
* regAddress : Register address
* bitIndex : Bit bit index
* bitValue : Desired value (0 or 1)
* timeoutMsec : Timeout (msec)