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What is the use of the an analog to digital converter ADC in an embedded systems context?
An analog to digital converter (ADC) converts an analog signal into digital form, shown in Figure 14.4. An embedded system uses the ADC to collect information about the external world (data acquisition system.) The input signal is usually an analog voltage, and the output is a binary number.
How many channels are present in ADC?
This card has 16 analog input channels (expandable to 512) and a maximum conversion rate of 769,000 samples/sec at 12-bit resolution. It has 2 analog outputs (expandable to 66) with a top data rate of 833,000 samples/sec.
What is meant by ADC?
aide-de-camp
An aide-de-camp (ADC) was defined in 1875 as “a confidential officer attached to the ‘personal’ or private staff of a general”. According to a British military dictionary dating from 1816, an ADC usually held rank equal to, or more senior than, an army captain.
How is ADC initialized in a microcontroller?
The ADC is initialized as we did with the accelerometer readings and in this case, we are connecting the X axis of the accelerometer to channel 0 and the Y axis to channel 1. There is not preinitialization of the ADC channel before we enable the ADC because we are starting with channel 0 which is the default channel.
Can a ADC read more than one channel?
The only thing to keep in mind when programming the ADC to read multiple channels is that only one channel can be used in the conversion at a time. If we had two sensors, and we are using channel (pin) 3 and 4 to read each sensor, we would first need to set the channel for 3 and then start a conversion.
How is the ADC on an ATmega8 microcontroller?
The ATmega8 features a 10-bit successive approximation ADC.ATmega8 has 7 channel ADC at PortC. The ADC has a separate analog supply voltage pin, AVCC. AVCC must not differ more than ± 0.3V from VCC.. The voltage reference may be externally decoupled at the AREF pin.
Can a microcontroller read more than one analog voltage source?
If you have more than one analog voltage source, more than one sensor, for instance, you can read all of them as long as the number of sources is fewer than the number of ADC pins you have on your microcontroller. With the Atmega32, there are 8 ADC pins.