Encoder Readings Jump

[MadsR]

Lake Profiler Version

0.4.13

Area(s) with issue?

Encoder

Steps to reproduce

Encoder Signal/Software/Readings sometimes jump several values.

✔️ Expected Behavior

No response

❌ Actual Behavior

No response

[MadsR]

Possible solutions Add encoder capacitors (small)

Resistor.

[MadsR]

EncoderInterrupt, ignore B, use Software Direction

[MadsR]

Large amount of EMI (electromagnetic interference) was observed at the lake which could explain the faulty readings, other sensors #10 also experienced faulty readings.

Proposed solution 1 Bevel Gear, Threaded Rod limit switch

• Mechanical Solution (robust)
• Adjustable (move limit switches, can build in depth markers)

Proposed solution 2 Wire Depth Markers + Reader. Add color or metal ring to wire at wanted depths along with a sensor to measure once positions are reached.

• Potentially Cheap
• Susceptible to noise (depending on signal-type)
• Can deteriorate over time (build.-up on cable/marker from lake)

Proposed solution 3 Time-based depth movement

• Cheap
• Fast to implement
• Works without mechanical alterations
• Repeatbility might fail
  • Voltage/Tension will affect motor speed = depth reached
• Recalibrate with depth reading

[MadsR]

Potential Solutions EMI hard to measure

• Individual source turned off and measure (then when you find culprit, can you even do something?)
• 3D mapping EMI (very expensive)

Measure noise

• Analog (PC powered) oscilloscope probe encoder lines

Noise Reduction

• Cover cables and sensor in tinfoil
• Twist cables

[MadsR]

Time-based encoder (Solution 3) developed, tested, and is now installed and running on system.