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To see how to install drivers and then issue commands under Windows or Linux see USB drivers installation. All commands are case insensitive, but here are presented using “camelCase”.

Results

result

The result command shows all the results stored in the flash memory. The maximum number of entries is 64, and all are stored along with date and time. If all 64 slots are full, the oldest result is discarded to free memory for the most recent one. The results are given in seconds and fractions of a second. This is the most precise format the stopwatch can output. Example output is presented below:

result
Best 00:05.04999

1 2021-02-03 11:02:06 00:05.05003
2 2021-02-03 11:03:16 00:05.05000
3 2021-02-03 11:04:24 00:05.04999

resultMs

The resultMs works almost the same as the result with the only difference in time units displayed. In this case, all the results are given in milliseconds. Note that this format is less precise than the other.

resultMs
Best 5050

1 2021-02-03 11:02:06 5050
2 2021-02-03 11:03:16 5050
3 2021-02-03 11:04:24 5050

clear

This command removes all the results from the flash.

last

The last command shows the most recent result stored in the flash. The result is displayed in seconds (with the fractional part). Example output might look like that:

last
00:08.01655

lastMs

The lastMs command shows the most recent result stored in the flash. The result is displayed in milliseconds. Example output might look like that:

lastms
8017

isCounting

The isCounting command returns 1 if the stopwatch is running. If it’s not, the command will output 0.

date

date outputs actual date and time in the YYYY-MM-DD HH:mm:ss format. For now, this command accepts no arguments, and so the date and time can be set only from the on-screen menu.

Device state

reset

Resets the stopwatch. Whether the device is currently running or displaying the last result, this command will reset it, and 000000 will appear on the display.

battery

Settings (persistent)

factory

Clears all the persistent settings from the flash. All settings are thus restored to their default state, which is equivalent to issuing the following set of commands:

res 10ms
bright auto
mode stop // This is currently not implemented
auto none
flip 0
ir 1
sn 1
blind 5000
trigger 10
fps 30

All the commands for storing persistent settings are described below.

flip

The command flip 1 flips the font displayed on the LED display upside down (except for the coma sign). The command flip 0 restores the display right side up again. The flip without any arguments shows the current value of the setting.

ir

Every stopwatch receiver has an IR sensitive element on the left side (there’s an orifice on the left wall which prevents unwanted DC ambient light getting inside). This built-in sensor may be turned off, issuing the command ir 0, or turned on by using ir 1. ir without any arguments shows the current value of the setting.

It is very important to remember to turn the built-in sensor off (the default) if it is not needed, for example, when using an external sensor. This is to prevent unwanted IR signals from interfering with the device.

Another possibility is to set up a system consisting of the receiver (a stopwatch with a display with it’s internal sensor turned on) + transmitter as a gate 1 and additionally external receiver + another transmitter as a gate 2. See … for more info about possible setups.

sn

This command follolwed by an argument 1 or 0 turns the built-in buzzer on or off. The ir without any arguments shows the current value of the setting.

res

The command res sets the resolution presented on the LED screen (and only there). It can be followed by an argument:

  • 10ms (the default)
  • 1ms
  • 100us
  • 10us

Issuing the command without any parameters outputs the value of the setting.

bright

The command bright governs how bright is the LED display. It accepts a single argument which has five possible values:

  • 1 the dimmest
  • 2
  • 3
  • 4 the brightest
  • auto the brightness is adjusted automatically according to the built-in photo-resistor located near the buzzer (the default)

Issuing the command without any parameters outputs the value of the setting.

blind

The blind command followed by the number of milliseconds enables the so-called blind period. This period occurs after each trigger event (just after the stopwatch starts or stops), and during that time, the stopwatch does not react to any trigger events. By default this setting equals 5000ms. For example if somebody would cross the gate less than 5000ms after the stopwatch started, nothing would happen.

Issuing the command without any parameters outputs the value of the setting.

fps (experimental)

The command fps followed by an integer sets the refresh rate of the LED display in the range from 20 to 1000 Hz. The feature is intended for slow-mo video, and for now is experimental and may be changed in the future.

trigger (experimental)

The trigger command followed by integer number of milliseconds tells the device what is the minimum trigger event length. This means that if the IR beam was interrupted for less than this setting, the stopwatch won’t start or stop. The default value equals 10ms.

Issuing the command without any parameters outputs the value of the setting.

Other commands

help

A help message showing possible commands.

auto

The command auto may be followed by a single argument:

  • s the most recent result is asynchronously outputted in seconds and fractions of a second format on the serial console.
  • ms the most recent result is asynchronously outputted in milliseconds.
  • none the most recent result is not outputted on the console (the default)

This setting is not persisted.

periph

This method takes no arguments and shows all the devices in the network along with their state. Example output may look like this:

periph
All devices (this dev at the top):
type uid active beam noise noise_level
receiver  1507373 1 0 0 0
ir_sensor 2097176 1 0 0 0
ir_sensor 2949133 1 0 0 0
ir_sensor 3407885 1 0 0 0

The columns have the following meaning:

  • type is the device type. For instance, receiver is for the stopwatch with a LED display, and ir_sensor is for the small external one.
  • uid : an unique ID.
  • active tells if the device is active, which for the receivers tells if their IR sensor is on or off. Only receivers allow the sensor to be turned on/off. This value corresponds to the ir command.
  • beam tells if the IR sensor sees the carrier signal (the IR signal).
  • noise tells whether the receiver experiences noise that prevents its normal operation.
  • noise_level is the severity of the noise and can be between 0 and 15. This value helps to set up the receivers in the presence of intensive sunlight. The preferred value here is 0.