add photosensitive epilepsy risk assement data and doc's.

health-and-safety/data/results/filtered_flicker_entries.csv

@@ -0,0 +1,8 @@
+2021-04-23 09:04:07.000000,"['41', '37', '36', '36']"
+2021-04-23 09:04:11.000000,"['36', '38', '40', '37']"
+2021-04-23 10:54:05.000000,"['39', '39', '40', '40']"
+2021-04-23 10:54:07.000000,"['39', '39', '39', '40']"
+2021-04-23 10:56:46.000000,"['40', '40', '39', '39']"
+2021-04-23 10:57:13.000000,"['40', '41', '40', '39']"
+2021-04-23 10:58:13.000000,"['39', '46', '44', '39']"
+2021-04-23 11:00:11.000000,"['39', '42', '46', '39']"

health-and-safety/data/results/readings-per-sec.csv

@@ -0,0 +1,4 @@
+1,5344
+2,2955
+3,13284
+4,8297

health-and-safety/data/test-data-lite.csv

@@ -0,0 +1,286 @@
+Id,Time Stamp,Reading
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health-and-safety/photosensitive_epilepsy.md

@@ -0,0 +1,174 @@
+
+# Return to Ritherdon: Photosensitive Epilepsy
+
+This document is to be used as part of the health and safety risk
+assessment for the Return to Ritherdon exhibition.
+
+## Summary of Assessment 
+
+The rate of flashes the lighting system produces is not of a higher
+enough rate to cause a photosensitive epileptic seizure -- according
+to the referenced sources below. Based on the **live test** data, the
+system produce a flash rate of **1 Hertz** through out the course of
+one day with *approximately* 8 to 9 hours on usage, on the
+23/04/2021. This falls outside the **3-30 Hertz** claimed by Epilepsy
+Society (link below).
+
+## Information About Photosensitive Epilepsy
+
+According to [Epilepsy
+Society](https://epilepsysociety.org.uk/photosensitive-epilepsy), a
+flashing/flicker light between 3-30 hertz can trigger a seizure.
+
+> What rate of flashing light can trigger seizures?
+
+> > Between 3-30 hertz (flashes per second) are the common rates to
+trigger seizures but this varies from person to person. While some
+people are sensitive at frequencies up to 60 hertz, sensitivity under
+3 hertz is not common.
+
+More information can be found at:
+
+- [Epilepsy Society](https://epilepsysociety.org.uk/) (home page)
+- [Epilepsy
+  Action](https://www.epilepsy.org.uk/info/photosensitive-epilepsy)
+- [National Health Service](https://www.nhs.uk/conditions/epilepsy/)
+  (NHS)
+
+## How This Relates to the Return to Ritherdon Project
+
+The project (unnamed at time of writing) this document refers to is
+one artwork in a much bigger project (called Return to
+Ritherdon). Within **'unnamed project**, is flashing lights. Because
+of that, the rate of flashing/flickering the artwork produces needs to
+be reviewed as part of the health and safety risk assessment.
+
+## Viewing the Raw Data
+
+This document will only provide a summarised view of the data because
+of the size of it. If you would like to review the raw data please
+head to:
+
+- [data](data)
+- [raw-data/results](data/results) (for the data after it's been
+  processed and used for this risk assessment)
+
+## How the Data was Processed/Reviewed
+
+The data was analysed using the code in the
+[Flicker](https://git.abbether.net/return-to-ritherdon/flicker)
+repository. Please review the code/repository there for more
+information on how the code works -- it is outside the scope of this
+document.
+
+## Breakdown of Data Analysis
+
+The sample of data reviewed for this assessment was taken from the
+Light Meter readings produced by `factory1` running the software
+provided by
+[Light-Meter](https://git.abbether.net/return-to-ritherdon/light-meter),
+on the **23/04/2021**. Overall, there was **84,294** light readings
+taken over the course of **between 8 to 9 hours**. Also, this was a
+**live test** with readings taken from the **intended environment**,
+under **real-world conditions**. Of those readings, the number of
+readings taken is as follows,
+
+*Note: Minutes and Hours are approximate values.*
+
+| Readings-per-Second | Seconds | Minutes | Hours |
+|---------------------|---------|---------|-------|
+| 1                   | 5,344   | 89      | 1.5   |
+| 2                   | 2,955   | 49      | 0.8   |
+| 3                   | 13,284  | 221     | 3.5   |
+| 4                   | 8,297   | 138.28  | 2     |
+|---------------------|---------|---------|-------|
+| Total               | 29,880  | 498     | 8.3   |
+
+Let's say you have the following readings (sample taken from
+`test-data.csv` stored in [raw-data](raw-data),
+
+**Note: The '.000000' is a artefact from the code's formatting of the
+data.** You can ignore it. I've only kept it in to keep the data here
+aligned as close as possible with the raw and computed data
+[data](data).
+
+| Time-Stamp (YYYY-MM-DD Hr:Min:Sec:MicroSec) | Reading |
+|---------------------------------------------|---------|
+| 2021-04-23 07:02:50.000000                  | 17      |
+| 2021-04-23 07:02:51.000000                  | 17      |
+| 2021-04-23 07:02:51.000000                  | 17      |
+| 2021-04-23 07:02:52.000000                  | 17      |
+| 2021-04-23 07:02:53.000000                  | 17      |
+| 2021-04-23 07:02:54.000000                  | 17      |
+| 2021-04-23 07:02:55.000000                  | 17      |
+| 2021-04-23 07:02:55.000000                  | 17      |
+
+**Note: I've omitted the `Id` column from the example above because is
+not relevant for this assessment.** If you review the raw data, you
+will come across that column. More often than not, you can ignore it
+if you're not looking to review/work with the code written for main
+the system.
+
+If you look at the time-stamp `2021-04-23 07:02:51.000000`, you will
+see there are two readings recorded. This sample is very small but you
+can see the remaining time-stamps have only one reading per each
+second intervals. With this in mind, please note there are eight
+reading spread across a five-second time-span. That is why the /first/
+table above is broken down into time and not just hard frequency
+totals. For 5,344 seconds on 23/04/2021, the system took a light meter
+reading at one reading-per-second.
+
+According to the sources listed above, 'between 3-30 hertz (flashes
+per second) are the common rates to trigger seizures'. This means the
+number of readings to review can be reduced to those operating at four
+readings-per-second. This is because the lights in this system need to
+go from an off-state (1) to an on-state (2) and back to an off-state
+(3). The extra (fourth reading) is needed because there needs to be a
+starting state (a zero if you will). Below is a sample of a moment
+when four readings were taken in a one second period,
+
+| Time-Stamp (YYYY-MM-DD Hr:Min:Sec:MicroSec) | Reading | State |
+|---------------------------------------------|---------|-------|
+| 2021-04-23 09:04:07.000000                  | 41      | On    |
+| 2021-04-23 09:04:07.000000                  | 37      | Off   |
+| 2021-04-23 09:04:07.000000                  | 36      | Off   |
+| 2021-04-23 09:04:07.000000                  | 36      | Off   |
+
+**Note: The light paired with `factory1` is set to turn on (in the
+gallery `gallery1`) when the reading is above 39.**
+
+In the table above, you will see the light changes state (on to off)
+once. For it to reach the noted rate of 'between 3-30 hertz', the
+third reading in the table will need to have been above `39` to
+trigger the light back on. This would have made the light change from
+on to off three times, taking into account the need for a 'starting'
+state.
+
+Referring back to the table listing the various rates of
+readings-per-second (the first table), there are only **8,297**
+readings (technically it's seconds but 'readings' is easier to
+process) instead of **84,294**. This can be filtered down even more,
+though. This is because not all four readings-per-second occurrences
+cause the light to change its current state (I.E. it doesn't go from
+off to on). With this in mind, the number of entries to review drops
+to **8** when you list just the times when the light changes its
+state. They are,
+
+| Time-Stamp                 | Readings       | States           | Hertz |
+|----------------------------|----------------|------------------|-------|
+| 2021-04-23 09:04:07.000000 | 41, 37, 36, 36 | on, on, off, off | 1     |
+| 2021-04-23 09:04:11.000000 | 36, 38, 40, 37 | off, on, on, off | 1     |
+| 2021-04-23 10:54:05.000000 | 39, 39, 40, 40 | on, on, on, on   | 0     |
+| 2021-04-23 10:54:07.000000 | 39, 39, 39, 40 | on, on, on, on   | 0     |
+| 2021-04-23 10:56:46.000000 | 40, 40, 39, 39 | on, on, on, on   | 0     |
+| 2021-04-23 10:57:13.000000 | 40, 41, 40, 39 | on, on, on, off  | 1     |
+| 2021-04-23 10:58:13.000000 | 39, 46, 44, 39 | off, on, on, off | 1     |
+| 2021-04-23 11:00:11.000000 | 39, 42, 46, 39 | off, on, on, off | 1     |
+
+This tables shows the limitations of the system to trigger a
+photosensitive epileptic seizure. The system produced **at most** a
+flash rate of **1 Hertz** over the course of **approximately 8 to 9
+hours** of activity.This is below the '3 to 60 Hertz' claimed by
+[Epilepsy
+Society(https://epilepsysociety.org.uk/photosensitive-epilepsy) (more
+references/links at the top of this file).