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API · /pid-api

PID Tuning API

healthy 4,305 Subscribers

PID-controller-tuning maths as an API, computed locally and deterministically. The ziegler-nichols endpoint computes controller gains with the closed-loop (ultimate-gain) method: from the ultimate gain Ku at which the loop sustains oscillation and its period Tu it returns the proportional, integral and derivative gains for a P, PI, PD or PID controller using the classic table (PID: Kp = 0.6·Ku, Ti = 0.5·Tu, Td = 0.125·Tu), in both the standard (Ti, Td) and parallel (Ki, Kd) parameters. The reaction-curve endpoint computes gains with the open-loop method from a step-response process model — the process gain K, the dead time L and the time constant T — using the Ziegler-Nichols reaction-curve table (PID: Kp = 1.2·T/(K·L), Ti = 2L, Td = 0.5L). The convert endpoint translates between the parallel form (Kp, Ki, Kd) and the standard form (Kp, Ti, Td) using Ki = Kp/Ti and Kd = Kp·Td. Everything is computed locally and deterministically, so it is instant and private. Ideal for industrial-automation, robotics, process-control, motor-control and IoT app developers, controller-tuning and loop-design tools, and control-systems education. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is PID controller tuning; for op-amp circuits use an op-amp API and for resonance and reactance a resonance API.

#pid #control-systems #ziegler-nichols #tuning #automation #developer-tools
api.oanor.com/pid-api
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Machine-readable spec so AI agents can integrate this API.

/api/pid-api/openapi.json
/api/pid-api/llms.txt

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API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
84 ms
Server probes · 24h
Subscribers
4,305
active
Total calls
28
last 7 days
status Full status page → · 16 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 2,850 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 2,850 calls/month
  • 2 req/sec
  • Closed-loop + reaction curve + convert
  • No credit card
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Starter

€10.00 /month

  • 41,000 calls / month
  • 6 requests / second
  • Hard cap (429 above quota, no overage)
  • 41,000 calls/month
  • 6 req/sec
  • P/PI/PD/PID, parallel & standard forms
  • Email support
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Pro

€25.00 /month

  • 249,000 calls / month
  • 15 requests / second
  • Hard cap (429 above quota, no overage)
  • 249,000 calls/month
  • 15 req/sec
  • Automation & robotics pipelines
  • Priority support
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Mega

€72.00 /month

  • 1,730,000 calls / month
  • 40 requests / second
  • Hard cap (429 above quota, no overage)
  • 1,730,000 calls/month
  • 40 req/sec
  • Platform scale
  • Dedicated SLA
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Vehicle-suspension maths as an API, computed locally and deterministically — the spring and frequency numbers a racer, tuner or chassis engineer sets a car up with. The wheel-rate endpoint converts a spring rate to the rate the wheel actually feels: wheel rate = spring rate × motion ratio², where the motion ratio is the spring's travel per unit of wheel travel — a 200 lb/in spring at a 0.7 motion ratio gives a 98 lb/in wheel rate, because the spring's leverage softens it. The frequency endpoint gives the ride (natural) frequency at a corner, f = (1/2π)·√(wheel rate × g ÷ corner sprung weight), the number that really sets the ride: luxury cars run about 0.5–1.2 Hz, sporty street 1.2–1.7, race cars 2 Hz and up. The spring-rate endpoint inverts it — the spring rate needed to hit a target frequency for a corner weight and motion ratio — so you can pick the frequency for the car's job and get the spring straight out. Everything is computed locally and deterministically, so it is instant and private. Ideal for motorsport and tuning apps, chassis-setup and corner-balancing tools, suspension-design calculators, and engineering study aids. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 compute endpoints. Estimates — real ride also depends on damping and tyres.

api.oanor.com/suspension-api

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api.oanor.com/drone-api

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Pressure-washer maths as an API, computed locally and deterministically — the cleaning-power, nozzle and water numbers a buyer or pro sizes and runs a machine by. The cleaning-units endpoint gives the cleaning power, PSI × GPM, with a duty class — both matter because pressure breaks the dirt loose and flow flushes it away, so a 3,000 PSI / 2.5 GPM machine (7,500 cleaning units) cleans far faster than the same pressure at 1.5 GPM. The nozzle endpoint gives the flow at a different pressure (a fixed nozzle flows with the square root of pressure) and the nozzle reaction force you feel, ≈ 0.0526 × GPM × √PSI in pounds — a few pounds on a consumer unit, enough on a big machine to need two hands. The water-usage endpoint gives the water used over a run, flow × time, in gallons and litres with an optional cost — a pressure washer actually uses far less water than a garden hose for the same cleaning. Everything is computed locally and deterministically, so it is instant and private. Ideal for pressure-washer shops and rental apps, cleaning-contractor and buying-guide tools, equipment calculators, and DIY sites. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 compute endpoints. Estimates — surface and detergent matter as much as the numbers.

api.oanor.com/pressurewasher-api

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api.oanor.com/solarthermal-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for PID Tuning API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call PID Tuning API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for PID Tuning API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does PID Tuning API cost?
PID Tuning API has a free tier with 100 calls / month. Paid plans start at €10.00 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is PID Tuning API GDPR-compliant?
All requests to PID Tuning API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Pick an endpoint from the list on the left to see its details and try it.

Code snippets

Sign up to get an API key, then call any path under your slug.

curl https://api.oanor.com/pid-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/pid-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/pid-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);
import requests
r = requests.get(
    "https://api.oanor.com/pid-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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