The E-STOP has two switches. The orange side is a Normally Closed SPST. The green side (not this test is a N.O. SPST).
Please note:
This issue is for a particular instance of a switch/button of the original poster. If someone else wants to test the same switch model, they should create a new issue.
The original poster can add additional test sessions to this issue (if they wish) by adding a comment.
Switch Info
Property
Description
Type
e-stop
Circuit
SPST
Function
On-Off (Normally closed)
Model info/markings
LAY37(PBC) Ui600VIth10A
Voltage & Current rating
600V 10A
Product URL: ebay listing expired
How new is the switch? never used before testing. purchased 2014 off ebay.
How do you like the switch? fun to hit, not sure I like it though. Seems a bit glitchy. Wouldn't use for anything important. Good for non-safety/fun projects.
Photos
Test Session 1
Setup
Property
Description
Arduino model
Uno (SMD)
Pull-up resistor
Arduino internal (42.2k measured)
Switch wires connection
screws
Measure switch's ON resistance
See notes below. Eventually settled to 0.5 ohms.
Anything else connected?
A few of the tests had the oscilloscope connected. See "Normal Scope" sections.
Measure switch's ON resistance: before first use I couldn't get a stable reading. Fluctuated between too high to measure, a few kilohms and a few hundred ohms. I wasn't moving anything. After a press & release, it dropped to around 90 ohms. A few more and it dropped to around 10 ohms. A few more and it dropped to around 1 ohm. After all tests (a few hundred presses), it ended with an on resistance of 0.5 ohms. I'd like to try testing again with a higher wetting current.
Test Setup Photo:
Please upload picture(s) of your test setup showing how the switch is connected to your Arduino. Please be wary of insecure wires/connections as they can cause many signal glitches.
When scope was connected:
Results
Test Section Details
Normal Scope 1 & 2: I had my picoscope connected with different time scales.
The "Fast" section activations were done with the butt of my fist as shown below. Not too much force. It didn't hurt my hand.
Hundreds of pulses per press/release. Interesting that presses bounce more, but releases have more transitions. Here's the graph sorted by transition count:
Some of the pulses are very short < 1 microsecond.
Scope Data Comparison
You can see scope vs Arduino data here.
Notes
Arduino data mapped to 0.2v and 4.8v (instead of 0v & 5v) to try and prevent clashing with scope data.
online graphing service limits rows to 5000. "flat" sections of scope data deleted to fit in 5000 rows.
I'm using a PicoScope 2204A: 10 MHz bandwidth, 100 MS/s, 8 k samples
The E-STOP has two switches. The orange side is a Normally Closed SPST. The green side (not this test is a N.O. SPST).
Please note:
Switch Info
Product URL: ebay listing expired
How new is the switch? never used before testing. purchased 2014 off ebay.
How do you like the switch? fun to hit, not sure I like it though. Seems a bit glitchy. Wouldn't use for anything important. Good for non-safety/fun projects.
Photos
Test Session 1
Setup
Measure switch's ON resistance: before first use I couldn't get a stable reading. Fluctuated between too high to measure, a few kilohms and a few hundred ohms. I wasn't moving anything. After a press & release, it dropped to around 90 ohms. A few more and it dropped to around 10 ohms. A few more and it dropped to around 1 ohm. After all tests (a few hundred presses), it ended with an on resistance of 0.5 ohms. I'd like to try testing again with a higher wetting current.
Test Setup Photo: Please upload picture(s) of your test setup showing how the switch is connected to your Arduino. Please be wary of insecure wires/connections as they can cause many signal glitches.
When scope was connected:
Results
Test Section Details
Normal Scope 1 & 2: I had my picoscope connected with different time scales.
The "Fast" section activations were done with the butt of my fist as shown below. Not too much force. It didn't hurt my hand.
📄 Raw data
e-stop-norm-close.txt
You can graph/analyze the data here.
🖼️ Summary Image
🕵️ Your Observations (optional)
Massive difference between press and release!
Hundreds of pulses per press/release. Interesting that presses bounce more, but releases have more transitions. Here's the graph sorted by transition count:
Some of the pulses are very short < 1 microsecond.
Scope Data Comparison
You can see scope vs Arduino data here.
Notes
Interactive Graphs: