What are the best coding classes in Castletroy?
Castletroy learners join a teacher live on video for every lesson, working in a small group at a single level or on their own, usually across two days a week, with enrolment open to all ages from six to sixty-seven. There is no journey involved. The first lesson is on us; after that, a monthly group place costs USD 100 and monthly private lessons USD 150.
About a kilometre from Castletroy College, the Office of Public Works runs a monitoring station at Annacotty that reports not just the river's level but six measures of the water itself, among them turbidity, conductivity, salinity, oxygen and pH. Before analysing any of them, a careful learner compares the columns with each other. In the 35 days to 19 September 2026, two of them match at every single reading: the column labelled salinity holds exactly the same number as the column labelled pH, 837 times out of 837. Two independent instruments never agree to the last decimal place every hour for five weeks. This page shows how to find a problem like that in a few lines of code, before it quietly spoils an analysis.
Facts last verified 20 September 2026. Teaching is online; no Castletroy branch is claimed.
Pick by age; in the free opening lesson the teacher either keeps the course or recommends another.

Blocks and matching: a spot-the-difference game where two pictures that should differ turn out identical.
See the syllabus
Python with two lists compared item by item, counting where they agree and where they differ.
See the syllabus
Sensor data in Python: comparing every pair of columns and testing values against what is physically plausible.
See the syllabus
For adults who inherit data pipelines and need automatic checks that catch a copied or mislabelled field.
See the syllabusBrowse the course atlas for more than one hundred options and use the coding roadmap to check prerequisites.
The four we are known for
These run underneath everything above. Every one is live and online, placed by ability rather than by age, and the first class is free.

Python, web and AI projects where the learner still owns the thinking.
See the syllabus
Automate the work you already do, then let AI carry part of it.
See the syllabus
Train a model, read what it learned, and be able to say why it is wrong.
See the syllabus
Run AI coding agents on real work without losing control of the codebase.
See the syllabusThe OPW's Annacotty station, six water-quality channels, 837 hourly readings each from 15 August to 19 September 2026, as published on waterlevel.ie. Each pair of channels was compared reading by reading.
| Channel pair | Readings compared | Identical |
|---|---|---|
| Salinity and pH | 837 | 837 |
| Turbidity and Temperature | 837 | 1 |
| Any of the other 13 pairs | 837 each | 0 |
Out of 15 possible pairings of the six channels, salinity and pH agree at all 837 readings. The next closest pair, turbidity and the channel labelled Temperature, coincides once, which is what chance produces.
The salinity column runs from 7.24 to 8.89, the same range as pH, while conductivity in the same water reads between 0.167 and 0.409. Salinity's correlation with conductivity is 0.313, exactly the same as pH's, and its correlation with pH is 1.000: the column carries nothing the pH column does not.
The check shows that two columns are copies. It cannot say which label is right, whether the fault is in the instrument or in publishing, or what the real salinity was. Those are questions for the data owner.
A sensor file can look perfect row by row and still be wrong as a whole: a column copied from another, two labels swapped, a unit changed without notice. Checks that compare columns catch what a glance at one column never will. Look for pairs that are identical far more often than chance allows, for columns whose range belongs to a different quantity, and for relationships that ought to hold and do not. Then report what was found to the publisher, and keep the suspect column out of the analysis until it is explained. This is about the relationships inside the data, which is a different habit from checking a file against its written description.
The learner's program downloads the month file for each channel, lines the readings up by timestamp, and for every pair counts how many times the two values are exactly equal. With six channels that makes 15 pairs, a double loop of a few lines. It prints a small grid of counts, flags any pair above a threshold such as half the readings, and then prints the minimum and maximum of every column beside its label so that a human can see whether each range makes sense for what the label claims. On this file the grid has one glaring cell and fourteen near-zeros.
Nothing in the other columns looks copied. Turbidity reached 44.1 at its highest in these weeks, dissolved oxygen ranged up to 107.7 percent of saturation, and the water level itself was read every 15 minutes, 3,348 times.
The OPW describes the readings on waterlevel.ie as provisional and unvalidated and asks users to credit the site. A flaw found in unchecked data is exactly the kind of thing validation exists to catch, and it says nothing about the river.
The counts refer to the month file downloaded on 20 September 2026. A later file may have been corrected, which is the outcome a good report hopes for.
Facts that each organisation publishes itself, on its own site or on the council's pages, with eircodes where they are given.
| Place | What its own source says |
|---|---|
| Castletroy College | Newtown, Castletroy, V94 6D85 |
| Gaelscoil Chaladh an Treoigh | Founded by the community in 2001, 438 pupils |
| University Concert Hall | Foundation Building, Sreelane, V94 PX58 |
| OPW Annacotty station | 1.07 km from Castletroy College |
Castletroy College describes itself as a co-educational community college of over 1,200 students under the auspices of Limerick and Clare Education and Training Board.
The council's page for Gaelscoil Chaladh an Treoigh says the school was founded by the community in 2001 to provide primary education through Irish, and has grown to 438 pupils with 26 full-time staff.
The University of Limerick says University Concert Hall opened in 1993, officially opened by Taoiseach Albert Reynolds and US Ambassador Jean Kennedy Smith, and has a 1,000-seat tiered lecture theatre.
What this page does not claim
No population is printed for Castletroy, because the page uses only facts that named organisations publish about the place. The sensor project says nothing about water quality or safety at Annacotty or anywhere else; it is about checking data before using it.
Two lessons fill most weeks, and each one is taught live by a teacher from start to finish.
Children begin with block code and matching games, noticing when two things that should be different are the same.
Teenagers take on Python, websites, AI projects and real sensor files like the Annacotty station.
Adults can start from nothing; the first lesson settles the course.
Sensor readings come from the OPW through waterlevel.ie; the pairwise counts, ranges and distance are our own calculations, run on 20 September 2026. The schools, the council and the university are quoted from their own pages.
Bands give a starting guess, and lesson one confirms the right level.
Block-coded games that compare two sets of shapes and count the matches.
Coding for KidsScratch Coding for KidsPython that lines up two lists and counts where they agree.
Python and AI for KidsMaths Through CodingEvery pair of columns compared, ranges tested and suspect data set aside.
Data Science for TeensPython for TeensAutomatic checks in pipelines that catch copied, swapped and mislabelled fields.
Python Automation CourseData Analysis CourseIt will usually describe each column as labelled.
Give an AI assistant the six Annacotty channels and ask for a summary of the water, and it will often report a salinity of around 8.4 as though it were real, perhaps even comment on it. Each column is summarised correctly. Nothing in that process compares the columns, so the copy goes straight through.
After running the pairwise check, the learner asks the assistant which columns ever share values, whether each range suits its label, and whether the columns that should move together actually do. An assistant that answers those has actually validated the file.
Summarising a column is quick. Noticing that two columns are secretly the same is the skill. The longer argument is in why learning to code still pays off for a learner.
The specifics.
Each lesson is run live by a teacher who follows every learner's screen and code as they work.
Five to ten learners at one level, from Castletroy, the rest of Ireland or abroad.
About eight lessons a month, on the same two weekly times set at the start.
The plan allows for holidays, mid-terms and exam weeks from day one.
A laptop or desktop, a microphone and speakers or headphones, and a connection that handles video.
One-to-one lessons for a learner who is ahead, needs more time, or can only attend when no group meets.
Only online
We have no premises in Castletroy, in Limerick or anywhere in Ireland. Lessons happen over video and are identical wherever the learner joins from.
All in one place.
A first lesson, with a level check, free of charge.
A month in a same-level group of five to ten, about eight live lessons.
A month of private lessons on the same schedule.
Every family outside India pays the same monthly US dollar fee. The free lesson commits no one, charges start with the course, and the pricing page covers holidays, missed lessons and moving between group and private teaching.
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Let us know the learner's age and what interests them, and the first hour will be shaped around it. It might end with a game, a working first program, or two columns caught being secretly the same.
Questions Castletroy families ask.
No. Lessons are taught live on video and we have no premises in Ireland. A learner needs a computer, sound and a microphone, and a reliable connection. The phone number here is our number in India.
Learners download the OPW's Annacotty water-quality files and compare every pair of columns. In the five weeks to 19 September 2026 the salinity and pH columns were identical at all 837 readings, which no two real instruments would produce.
No. The project is about checking data, not judging water quality. It uses provisional, unvalidated readings, and questions about the river are for the responsible authorities.
District pages use only facts that named organisations publish about the place, here the schools, the council, the university and the OPW, and none of them gives a head count.
Weekday afternoons after school and into the evening, and weekend daytimes. All times are in Irish time; our teachers work from India, four and a half hours ahead during Irish summer time and five and a half in winter, and only hours that suit both sides are offered.
Yes, for anyone up to sixty-seven, beginners included. After the first lesson an adult chooses a small group at their level or lessons on their own.
Not necessarily. Groups depend on level, so classmates may be in Limerick, elsewhere in Ireland or overseas.
The first lesson is free. A group place is then USD 100 a month for about eight live lessons, two a week, with five to ten learners, and one-to-one lessons on the same schedule are USD 150 a month. Terms are agreed before anything is paid.
Five to ten learners, grouped by level, pace and aims rather than age or address. If no group fits a workable hour, lessons are one to one.
The Limerick page covers the city and its university, Shannon is across the estuary with an airport data project, and the Munster page links the province together. For more sensor data, the Cork district of Ballincollig reads the Lee below a dam, and the Ireland hub lists the rest.