Block availability varies by board type.
Propeller Activity Board board type only
The A/D read block is designed for the A/D and D/A circuits built directly into the Propeller Activity Board (original and WX)
This block reads and reports the voltage input on the A/D channel chosen in the drop-down menu. The value provided by the block is in volt-hundredths: if +2.50 volts is applied to the A/D channel, the block will provide a value of 250. It can be attached to a variable set block or used wherever a number value block is accepted.
Propeller Activity Board board type only
This block launches a processor automatically. Using a second block for an additional D/A channel will not launch an additional processor.
The D/A output block sets the output voltage on the D/A channel chosen in the drop-down menu. The block expects a value in volt-hundredths: if value block placed in this block is 250, the D/A will output +2.50 volts.
Propeller FLiP or Project Board and Other board types only
The A/D chip read block is designed for specific analog to digital converter chips that can be added to the prototyping area of Propeller boards. This includes the ADC0831 [1]and MCP3002 [2]carried by Parallax, as well as other chips in the MCP3 line.
This block reports the voltage input on a channel of a supported A/D converter chip. It can be attached to a variable set block or used wherever a number value block is accepted. To use the block:
The value provided by the block is in volt-hundredths: if +2.50 volts is applied to the A/D channel, the block will provide a value of 250. Unless the A/D chip set Vref block is used, this block assumes that the A/D chip's Vref pin is connected to +3.3 volts.
Propeller FLiP or Project Board and Other board types only
The A/D chip set Vref block is designed for specific analog to digital converter chips that can be added to the prototyping area of Propeller boards. This includes the ADC0831 [1]and MCP3002 [2]carried by Parallax, as well as other chips in the MCP3 line.
This block is used to improve the accuracy of the value returned by the A/D chip read block and/or to use a different voltage (such as +5.0 volts) for the A/D chip's measurements. Use this block before the A/D chip read block in your project, or at the beginning of your program to set the Vref value globally. Enter the value of the voltage applied to the A/D chip's Vref pin. The number entered is in volt-hundredths; if +3.3 volts is applied to Vref, enter 330.
Links
[1] http://learn.parallax.com/tutorials/language/blocklyprop/tilt-tones-blocklyprop
[2] https://www.parallax.com/product/603-00039