Yesterday we looked at how PowerShell can turn IEEE754 floating point values returned by a sensor into the actual value. This involved reversing the byte order and using the BitConverter class.
If you have received a IEEE754 value in hex format, like 0x3FA8FE3B, the first task is to split the hex value into four bytes. There is a surprisingly easy way to do this: treat the hex value as an IPv4 address. These addresses internally use four bytes as well.
Here is a quick and simple approach to turn the sensor hex value into a useful numeric value:
$hexInput = 0x3FA8FE3B $bytes = ([Net.IPAddress]$hexInput).GetAddressBytes() $numericValue = [BitConverter]::ToSingle($bytes, 0) "Sensor: $numericValue"
Your learning points:
- Convert numbers to an IPAddress object to split the number into bytes. This approach can also be used to get the Least Significant Byte (LSB)or Most Significant Byte (MSB)from a number
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