Development of a Low Cost Penetrometer with Depth Measurement

The micro-controller base penetrometer with depth measurement consists of sensing unit, signal modifier, ardunio uno micro-controller board, and with intelligent display unit. The sensing unit is made of two part the penetrating force unit, and ultrasonic unit which determines the depth. The signal modifier unit amplifier the output signal from load cell sensor fed into load cell amplifier and used to obtained penetrating force and pressure. The system has the maximum capacity of 500 N, of penetrating force and maximum pressure of 4000 bar. Also maximum depth of penetration is given as 1300 mm. The force applied unit in term of mass percentage error is 0.006 with ±0.12 g deviated from true value. The standard deviation value is closed to zero that is 0.03. The resolution depth has 1 cm. The speed measuring unit has correlation value when compared value with car pass with predetermined value on speedometer was closed to unity and absolute deviation value 0.43.