PowerShell is extremely versatile and nowadays often used with IoT and sensors as well. Some return values in IEEE754 float format which typically is a series of four hexadecimal bytes.
Let’s assume a sensor returns a value in the hexadecimal format of 3FA8FE3B and uses IEEE754 formatting. How do you get the real value?
Technically, you have to reverse the byte order, then use the BitConverter to produce a “Single” value.
Take 3FA8FE3B, split it into pairs, reverse the order, then convert to a number:
$bytes = 0x3B, 0xFE, 0xA8, 0x3F
As it turns out, the hex value 0x3FA8FE3B returns the sensor value 1.320258. Today, we focused on the BitConverter class that provides methods to convert byte arrays to numeric values. Tomorrow, we look at the other part: splitting text hex values into pairs and reversing the order.
Learning points for today:
PS> [BitConverter] | Get-Member -Static | Select-Object -ExpandProperty Name
To see the syntax for any of these methods, enter them without parenthesis:
static uint32 ToUInt32(byte value, int startIndex)
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