Double Tapping Investigation Report

Detailed report on what the issue is, how it happens, and how to prevent it from happening to your Sim Pad.

What is double tapping?

Some users of Sim Pad 2 have reported that their Sim Pads are registering multiple key inputs when pressing the key once.

The percentage of the people experiencing this issue is less than 0.1% and is not considered a major issue or defect with the device.

Sim Pads are designed similarly to other hot-swappable mechanical keyboards and use the same materials and parts that are industry standard with other mechanical keyboards.

Thus, we have since launched an investigation into why this issue is occurring

To view our findings, please scroll to the bottom and view the "Conclusion" of this report.

Test 1: High number of hard presses

Our first theory was that Sim Pads experiences a higher than average amount of keypresses due to the keypads being used for rhythm games. We think high numbers of hard presses can potentially damage the switch or PCB of the Sim Pad.

We find this theory to be not responsible for double tapping.

We set up a rig to pound each key with 30 pounds of force at 2,500 RPM. The rig pounded the keys over 1,000,000 times and we observed no changes in performance.

1,000,000 keypresses is equivalent to single-tapping Road of Resistence [Monstrata] 600 times consecutively.

Test 2: Dust particles in sockets

Dust particles can cause issues with the sockets since the hot swappable sockets are highly sensitive to disruptions. So we put a lot of dust particles into the device to see if that will damage the sockets.

The result is inconclusive. Depending on the level of dust particles within the device, it can damage the circuitry and other components. We think dust particles can cause double tapping but not a direct relation.

Test 3: Improper swaps and excessive force

Our third test was conducted with a team of engineers from Kailh, the manufacturer of the hot-swappable sockets. Kailh hot-swappable sockets are rated for 100 swaps before any signs of deterioration.

Kailh engineers evaluated the problems and have determined that double tapping issues are caused by user error.

When replacing switches, it is highly likely that improper swaps and use of excessive force when inserting switches can cause the hotswap sockets to move out of place, causing issues with detection and contact with the switch.

We conducted a test to see if this is the case and it is indeed a cause for double tapping issues. We tried inserting switches in different angles with vary degree of force and have found that when inserted at an angle with excessive force, it damages the sockets, causing issues with detection.

We believe this is the main cause for double tapping issues.

Conclusion

Based on our findings, double tapping issues are caused by improper insertion of switches into the hotswappable sockets.

The average lifespan of the Kailh hot-swappable sockets are rated at 100 swaps. Due to the nature of the Sim Pad being a keypad used for rhythm games, it is natural that the keypad experiences higher than average amount of switch swaps.

In order to perserve the lifespan of the sockets and prevent double tapping, we recommend swapping switches with care and not use excessive force.

What we are doing in the future...

We are looking at potential design solutions that can reduce the amount of double tapping issues. Please note that double tapping issues affect less than 0.1% of Sim Pads. In our future products, we will be implementing new designs that alleviate this issue.

This report was conducted and written by the Momokai Team with the help of mechanical keyboard designers and engineers from Kailh