AS TFmini Plus - Judgment Logic and Signal Output; Modification of Switch Value Threshold; Required Tools for Product Test; Test Procedures

Switch Value Output of TFmini Plus v1.0
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3 Judgment Logic and Signal Output of TFmini-Plus Switch
Value
Assuming that the TFmini Plus detection threshold is 2m. When the measurement value of
TFmini-Plus is less than 2m , in other words, there is an object within 2m in front of TFmini Plus,
the TXD output is high level (3.3V); and when the measurement value of TFmini-Plus is beyond
2m , the TXD output is low level (0V).
Ps: The level is relative to GND. Please pay attention to be common-ground before measuring.
4 Modification of the Switch Value Threshold
The measurement threshold can be modified by the TFmini Plus through serial commands. The
steps are as follows.
4.1 Required Tools of Product Test
TFmini Plus
wires
TTL – USB board
USB
computer
Serial assistant
4.2 Test Procedures
Fig.2 Correct Connection
Connect “TFmini Plus”, “TTL - USB board” and “USB cable” as shown in Figure 2. Make
sure there is no loose connection. Then connect “USB cable” with “PC”.