ADC/en

How to get voltage from ADC

1. Select the terminal to which your source can be connected based on the maximum allowable voltage (see table below).
2. Most ADC terminals have two functions: ADC and low-voltage load control. Before measuring the voltage on the ADC, turn off the appropriate low-voltage load control output. For example, if you are connecting to terminal A1, turn off A1_OUT in the web interface (the Relays & FETs section).

   For details, see Multiplexing ports

3. Connect your source to the terminal. The voltage value will immediately appear in the веб-интерфейсе in the ADCs device. The value is also translated to the MQTT message systemMQTT.

Using values from external programs

A special WB-homa-adc driver translates the value to the MQTT system and can be obtained there.

Also, the value can be obtained in manual mode:Низкоуровневая работа с ADC.

Resistance measurement

Wiren Board 5.8 controllers and below were able to measure the resistance of resistors connected to the R1 and R2 inputs.

TODO: you should write here how to configure resistive inputs through the web interface.

See ADC:Измерение сопротивлений - технические детали

Input voltage

Демон wb-homa-adc транслирует значение в очередь сообщений MQQT в топик /devices/wb-adc/controls/Vin . Таким образом, значение отображается в веб-интерфейсе как канал Vin устройства ADCs

The wb-homa-adc daemon translates the value to the MQQT message queue in the /devices/wb-adc/controls/Vin topic. Therefore, the value is displayed in the web interface as the Vin channel of the ADCs device

Battery voltage

The wb-homa-adc daemon translates the value to the MQTT message queue in the topic /devices/wb-adc/controls/BAT. Therefore, the value is displayed in the web interface as the BAT channel of the ADCs device

Manual mode: see low-Level ADC operation.

Technical details on the implementation of the ADC

Wiren Board сontrollers versions 2.3 and 4 have 8 ADC channels that are multiplexed into one processor channel (LRADC1). Multiplexing channels are shown in the table Wiren Board 4:Список GPIO.

The Wiren Board 5 uses 8 different ADC channels that are connected to separate processor channels. The 4V line is connected to the BAT channel (LRADC7), in addition to measuring the voltage at the 2 resistive inputs, 4 universal inputs A1-A4 and the input voltage (see table below).

The ADC channels serving the R1 and R2 inputs have a built-in independent current source that is used to measure the resistance connected to the channel. Current source accuracy: 5%. See Calibration of analog inputs.

In Wiren Board 6, the ADC channels of the processor are connected to terminals A1-A4. Also, the ADC has input voltage (after the input diodes) and voltage at the terminal 5Vout.

The main channels

A part of the ADC channels is output to the terminals in parallel with the low-voltage load control transistors. Make sure you have closed the corresponding FET using GPIO before using the ADC. For details, see Мультиплексирование портов

Списки АЦП для разных устройств

Wiren Board 6

См. Wiren Board 6.2: Peripherals#Каналы АЦП

Wiren Board 5

клеммник	Канал АЦП (LRADCxx)	Делитель	Итоговая формула (без делителя)	V макс. измеряемое	комментарии
A1	1	88k7/12k	V = N * 3.80 mV	31V
A2	2
A3	3
A4	4
R1	6	1	V = N * 0.4518 mV	3.1V	r2 = 3150 Ohm, r1 = 1000 kOhm
R2	0
4В/li_pol	7		V = N * 1.807 mV	-	на линии 4 В
Vin	5	88k7/12k	V = N * 3.80 mV	31V	входное напряжение

WB4

клеммник	Делитель	Формула для пересчета	Итоговая формула (без делителя)	V макс. измеряемое (с делителем)	комментарии
A1-A3	100k/90.9k	N / 4095 * 1.85V * 2.100	V = N * 0.949 mV	7.4V
A4-A5	100k/11.86k	N / 4095 * 1.85V * 9.43	V = N * 4.26 mV	34.4V
R1-R2	3k15/1M	N / 4095 * 1.85V * 1.003	V = N * 0.426 mV	3.7V
li_pol	100k/90.9k	N / 4095 * 1.85V * 2.100	V = N * 0.949 mV	-	на аккумуляторе
Vin	33k/4k51	N / 4095 * 1.85V * 8.32	V = N * 3.76 mV	30.6V	входное напряжение, iio channel 0

WB3.5

клеммник	Делитель	Формула для пересчета	Итоговая формула	V max	комментарии
A1-A4	220k/22k	V = N / 4095 * 1.85V * 11	V = N * 4.97 mV
R1-R4	-	V = N / 4095 * 1.85V	V = N * 0.452 mV
Vin	33k/4k53	N / 4095 * 1.85V * 8.28	V = N * 3.74 mV	30V	входное напряжение, iio channel: 0

WB NETMON-1

клеммник	Делитель	Формула для пересчета	Итоговая формула (без делителя)	V макс. измеряемое (с делителем)	комментарии
A1-A8	31k/4.68k	N / 4095 * 1.85V * 7.627	V = N * 3.446 mV	20V
Vin	12k/1k	N / 4095 * 1.85V * 13	V = N * 5.873 mV		входное напряжение

WB2.8

клеммник	Делитель	Формула для пересчета	Итоговая формула	комментарии
A1-A7	12K/33K	V = N / 4095 * 1.85V * 1.364	V = N * 0.616 mV