Maker Electronics Math : Count the Milliamps - Ohm's Law, Batteries, Sensors and Duty Cycles in Plain English, and One Battery-Powered Sensor Sized to Last a Year Before You Build It
Language: English
Published by Independently Published Sep 2026, 2026
- Softcover
- New
Seller: AHA-BUCH GmbH, Einbeck, GermanyAHA-BUCH GmbH
AbeBooks seller since August 14, 2006
Condition: New
£ 29.01
Quantity: 2 available
Add to basketItem description from seller
Neuware.
Seller Inventory # 9798171739843
- Title
- Maker Electronics Math : Count the Milliamps - Ohm's Law, Batteries, Sensors and Duty Cycles in Plain English, and One Battery-Powered Sensor Sized to Last a Year Before You Build It
- Author
- Sizu Riatto
- Publisher
- Independently Published Sep 2026
- Publication year
- 2026
- Condition
- Neu
- Binding
- Taschenbuch
- Language
- English
- ISBN 13
- 9798171739843
- Item weight
- 612 grams
- Dimensions
- 279x216x14 mm
This book answers it with arithmetic you can do with a pencil, on one real device. The Long Watch is a sensor the size of a paperback that wakes once a minute, records how cold and how damp it was, and tells you how many hours it was past a line you care about. Hours below freezing. Hours above 70% damp. Hours under the humidity a mushroom flush needs. A thermometer tells you it hit −2 °C; this tells you it was below zero for five hours, which is the number that decides whether the crop lives.
It runs 375 days on three AA cells — and you work that number out in Chapter 3, long before the thing exists.
Who this is for: Arduino and Pi Pico beginners, weekend makers, growers with a greenhouse or grow tent, and anyone whose battery project died in a fortnight and never found out why.
Thirteen chapters, thirteen finished numbers:
- One LED, one resistor — and why you round the resistor up, not to the nearest value
- What a battery holds — and the capacity you never reach, because your circuit gives up first
- Current × time — the whole year, worked out on one sheet of paper
- Dividing a voltage — a divider that reads the pack without quietly draining it
- Volts to numbers — what one ADC count is actually worth, and when more bits buy nothing
- Making a sensor tell the truth — two known points, and the straight line between them
- R, C and time — settling, debounce, and how long a thing takes to be ready
- Switches, pull-ups and a screen that is off — what two resistors cost you per year
- PWM and brightness — why half the duty is nothing like half the light
- The regulator and heat — the part that was in every sum and never examined
- Storing and sending — the second budget, counted in bytes, and what a radio really costs
- The same node, two other jobs — when a runtime stops being a number and becomes a range
- The capstone — build it, measure it, and explain the gap between measurement and prediction
Two inversions most beginners get backwards. The battery goes into the waking, not the sleeping — 1.2 seconds of every minute spends 87% of the budget, so the lever is a shorter wake, not a cleverer sleep mode. And two resistors too small to feel, left permanently connected, take 375 days down to 186.
Bring your own node. The demo device is worked in full, every figure shown — and beside it, on the same sheet, runs yours: your wake interval, your cells, your sensor. By Chapter 11 you hold a complete current budget for a device of your own choosing. By Chapter 13 you have measured one and explained why it disagreed with you.
Every chapter ends with a graded practice set and an answer key that walks the reasoning, not just the number. A fill-in budget sheet at the back, and nineteen free calculators online - no account needed.
Nothing in this book touches mains electricity, and no soldering iron is needed. Battery and USB only, from the first page to the last.
Predict the battery life. Then check it in an afternoon.
This book was written in collaboration with AI tools. Every number in it — every current, every charge, every runtime, every price — is recomputed from first principles by an automated arithmetic harness, and the book does not go to print unless all 825 checks pass.
This book teaches arithmetic, not procedure. It is not a substitute for the datasheet of the part in front of you. All prices are illustrative and dated, shown beside a blank for your own.
"Synopsis" may belong to another edition of this title.
Shipping rates from Germany to U.S.A.
| Item | 7 to 10 business days | 5 to 7 business days |
|---|---|---|
| First item | £ 30.14 | £ 38.75 |
Payment methods
- Bank Wire Transfer
- Check
- Paypal
Store description
Das Unternehmen AHA-BUCH GmbH: Seit der Gründung von AHA-BUCH im Juli 2005 ist unser Hauptziel, zufriedenen Kunden so schnell und so preisgünstig wie möglich ihren Bücherwunsch zu erfüllen. Unsere Firma beschäftigt 16 Mitarbeiter, die nur ein Ziel kennen: den Kunden und seine Wünsche! Auf über 3700 m2 Fläche haben wir über 100.000 Bücher, Modernes Antiquariat und Spiele auf Lager.
Specialty
Kinderbücher & Kinderhör Casetten, German Books, Software, Natur & Tiere, Ratgeber, Sachbücher, Englische Bücher, Medizin & Gesundheit, Universität & StudiumSeller's business information
AHA-BUCH GmbH
Garlebsen 48
Einbeck, Germany 37574
Terms of sale
Imprint
Seller Info:
AHA-BUCH GmbH
represented by the managing director Christel Glass
Garlebsen 48
37574 Einbeck
Deutschland
Telefon: 055639996039
Telefax: 055639995974
E-Mail: abebooks@aha-buch.de
USt-IdNr.: DE261904229
registered at Commercial register Amtsgerichtes Göttingen
Handelsregisternummer HRB 200691
Alternative dispute resolution:
The European Commission provides a platform for out-of-court online dispute resolution (ODR platform), which can be accessed under https://ec.europa.eu/odr.
We have been a member of the "FairCommerce" initiative since 25.05.2018.
For more information, see www.fair-commerce.de.
Right of withdrawal
If you are a consumer you can withdraw from the contract in accordance with the following. Consumer means any natural person who is acting for purposes which are outside his trade, business, craft or profession.
Information regarding the right of withdrawal
Statutory right to withdraw
You have the right to withdraw from this contract within 14 days without giving any reason.
The withdrawal period will expire after 14 days from the day on which you acquire, or a third party other than the carrier and indicated by you acquires, physical possession of the last good or the last lot or piece.
To exercise the right of withdrawal, electronically fill in and submit a clear statement on our website, under "My Purchases" in "My Account". We will communicate to you an acknowledgement of receipt of such a withdrawal on a durable medium (e.g. by e-mail) without delay.
To meet the withdrawal deadline, it is sufficient for you to send your communication concerning your exercise of the right of withdrawal before the withdrawal period has expired.
Effects of withdrawal
If you withdraw from this contract, we will reimburse to you all payments received from you, including the costs of delivery (except for the supplementary costs arising if you chose a type of delivery other than the least expensive type of standard delivery offered by us).
We may make a deduction from the reimbursement for loss in value of any goods supplied, if the loss is the result of unnecessary handling by you.
We will make the reimbursement without undue delay, and not later than 14 days after the day on which we are informed about your decision to withdraw from this contract.
We will make the reimbursement using the same means of payment as you used for the initial transaction, unless you have expressly agreed otherwise; in any event, you will not incur any fees as a result of such reimbursement.
We may withhold reimbursement until we have received the goods back, or you have supplied evidence of having sent back the goods, whichever is the earliest.
You shall send back the goods or hand them over to AHA-BUCH GmbH, Einbeck, Germany, without undue delay and in any event not later than 14 days from the day on which you communicate your withdrawal from this contract to us. The deadline is met if you send back the goods before the period of 14 days has expired. You will have to bear the direct cost of returning the goods. You are only liable for any diminished value of the goods resulting from the handling other than what is necessary to establish the nature, characteristics and functioning of the goods.
Exceptions to the right of withdrawal
The right of withdrawal does not apply to:
- The delivery of newspapers, journals or magazines with the exception of subscription contracts; and
- The supply of digital content which is not supplied on a tangible medium (e.g. on a CD or DVD) if you accepted when you placed your order that we could start to deliver it, and that you could not withdraw once delivery had started.
Shipping terms
We ship your order after we received them
for articles on hand latest 24 hours,
for articles with overnight supply latest 48 hours.
In case we need to order an article from our supplier our dispatch time depends on the reception date of the articles, but the articles will be shipped on the same day.
Our goal is to send the ordered articles in the fastest, but also most efficient and secure way to our customers.