The idea and the team are ready. Now comes the concrete side: what to buy, how much it will cost, and when you will work in the workshop? Shopping without a plan burns both money and time.
This article is the fourth part of our Project and Contest Guide series. We explain the materials list, a simple budget, and a workshop plan.
Remember: First build a prototype with what you already have. Leave expensive parts for last. Spending early on an idea that does not work is the most expensive mistake.
How do you make a materials list?
Keep the list in three columns:
| Part | Why do you need it? | Have / Need / Order |
|---|---|---|
| Arduino UNO | Main board | Have |
| HC-SR04 | Distance measurement | Order |
| Jumper wires | Connections | Have |
| 9V battery + jack | Power in the field | Need |
For every row ask "What if we do not have this?" If the project still works without it, postpone that part.
A simple budget
- What already exists at school / in the workshop (count as free)
- What you will buy (price + shipping)
- A spare margin (10–15 percent)
- Total support (family / school support)
Shrink any idea that goes over the total. "We really want it" and "we can pay for it" are different things.
Workshop plan
- How many days a week, how many hours?
- Who will enter with teacher approval?
- Safety: goggles, ventilation, soldering rules
- Cleaning and materials-cabinet order
- Desk / power needs for testing
Remember our workshop safety articles too: fast work is not the same as unsafe work.
Examples close to real life
1. Ordering everything at once
You bought 10 sensors before a basic LED even worked. Most of them stayed in the box.
Start with a minimum set: board + 1 sensor + cable + power.
2. Shipping delay
In the last week a critical part was still on the way.
Order critical parts early. Write an alternative plan (another sensor / another method).
3. Shared materials going missing
The jumpers scattered; nobody knows where they are.
A small box + a name list. Whoever uses them puts them back.
4. Unclear workshop hours
You said "We'll come when we're free" and never managed to meet.
Write a fixed day on the calendar. If someone is absent, add a backup day.
5. Skipping safety
You soldered in a rush but did not wear goggles.
Injury is the worst outcome for a contest.
A short note for parents: Clarify the budget together. Unlimited spending does not lead to results; measured support and following the list matter more.
Short questions you can ask yourself
- Which parts are required for a minimum working version?
- What is our total budget ceiling?
- Is this week's workshop day written down?
- If a critical part is delayed, what is plan B?
What is next?
In the next part we will cover prototype and testing.
List + budget ceiling + calendar — this trio keeps the project standing.
