Charge the ring
Seat the ring on the magnetic charger. An internal glow is visible while it charges. A full charge from empty takes about 2 hours.
The cable ends in USB-A; a power adapter is not included.
00 / START
Preflight checklist
Before starting a participant session, make sure the hardware, fit, app, and storage state are ready.
Bring
- BIOPAC Research Ring
- Magnetic USB-A charging cable
- USB power adapter — not included with the ring
- Correct clear sizing shim
- iPhone or iPad with Senstream installed
Confirm
- Ring has been charged
- Sensor block touches palm-side skin
- Ring appears inside Senstream — not iOS Bluetooth Settings
- Required recording configuration is selected
- Ring is off the charger before recording
Fast workflow: charge → fit shim → wear snugly → add ring in Senstream → choose configuration → remove from charger → record → confirm cloud checkmark or local-file location.
01 / SYSTEM
Know the ring
The May 2026 BIOPAC product sheet identifies the device as AT01. The exact model printed on this lab package has not yet been verified.
Measured signals
EDA, PPG, brief ECG, temperature, and accelerometry.
Derived outputs
Heart rate (HR) and heart-rate variability (HRV).
Wireless link
Bluetooth Low Energy.
Battery
Runtime may exceed 8 hours, depending on enabled channels and sampling.
Cloud
charts.senstream.com is listed as the cloud portal. Portal access has not yet been verified in this setup.
Multi-ring option
Optional ACK100W-RNG AcqKnowledge Ring Software supports up to 9 rings per computer.
Continuous ECG needs additional hardware
Use the RESRING-ECG-ADAPT together with the RESRING-LEAD. The ring itself is listed for brief ECG.
02 / SETUP
Complete setup, in order
Follow these steps from power to pairing. Fit is not cosmetic: stable sensor-to-skin contact is essential for uninterrupted data.
Select the sizing shim
Choose the clear sizing insert that removes slack and keeps the finger pressed against the sensor block. The shim used in this setup is marked size 9.
Fit targetSnug and stable, without the sensor block lifting away from the skin.
Insert the shim
Slide the shim into the ring band. Seat the shim’s curved channel inside the band and make sure its clips engage the band.
Position the sensor block
The sensor block contains the gold EDA electrodes and the PPG optical window — the dark square with the red optical element visible in the close-up.
Place this complete sensor area against the palm-side skin of the finger, with firm, continuous contact.
Wear the ring at the finger base
Push the ring down toward the base of the finger. It should hold securely against the skin and resist sliding during recording.
If another finger gives a more stable fit, use it. The middle finger produced a snugger fit during troubleshooting.
Install Senstream
Install Senstream on an iPhone or iPad. Senstream is available only on iOS/iPadOS; there is no Android version.
Firmware requirementRing firmware updates require Senstream on iOS/iPadOS 16.6 or later.
Add the ring inside Senstream
Do not pair the ring from iOS Settings → Bluetooth.
The ring does not appear there. Open Senstream and add the ring from inside the app. In this setup, the app displayed ring ID 20540 and “1 Ring Connected.”
03 / RECORD
Start and monitor a session
Use the recording dialog to name the session, select the signal configuration, and begin acquisition.
Start sequence
- Tap Record New Session.
- Open the Record Session dialog.
- Choose New Recording Session.
- Select a recording configuration.
- Take the ring off its charger when prompted: “Remove Ring from Charger.”
- Start the recording.
Available configurations seen in this setup
| Configuration | Channels and rates | Note |
|---|---|---|
| A | PPG 200 Hz · EDA 5 Hz · Temperature 5 Hz | Selected in this setup |
| B | ECG 200 Hz · PPG 25 Hz · EDA 5 Hz | Shown in the app |
During recording
The session screen shows live traces for PPG, EDA, temperature, and acceleration, a pulsing PPG trace, and a session timer.
A Mark Event button is visible. Its behavior was not verified during this setup, so this guide does not assign it a function.
Keep the signal stable
Keep the hand still, avoid rotating the ring, and watch for a continued live trace rather than a “No Finger” state.
04 / DATA
Cloud sync and app settings
The setup account is signed into Senstream Cloud. Confirm storage and synchronization before ending the workflow.
Cloud state observed
Senstream Cloud was signed in as Chinonso Anyaehie (infosysscholar@gmail.com).
Recorded sessions display green cloud checkmarks when synced. Storage can be changed with Switch to Local Files Browser.
After every sessionConfirm the expected session appears and, for cloud storage, that its green cloud checkmark is visible.
Session storage
Switch to Local Files Browser
Senstream Cloud account
Delete Account
Sign Out
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What’s New
05 / FIX
Troubleshooting “No Finger”
During this setup, “No Finger” dropouts were linked to intermittent skin contact.
Symptom
Live acquisition drops to “No Finger” or the session stops updating.
Cause observed
The sensor block is losing firm, continuous contact with the finger.
1 · Re-seat
Push the ring toward the base of the finger.
2 · Reduce slack
Add the correct sizing shim and ensure it is clipped into the band.
3 · Minimize motion
Keep the hand still during recording.
4 · Try another finger
The middle finger gave a snugger fit during this session.
5 · Warm cold hands
The room was 20.2°C; cold hands may have contributed to contact or signal instability.
6 · Restart cleanly
After correcting the fit, end the frozen session and start a new one.
Do not guess from light colorsThis guide does not assign meanings to LED colors or patterns because those meanings were not verified in the setup session.
06 / STATUS
What is verified — and what is not
This boundary keeps the guide honest and tells the next operator exactly where testing should continue.
Verified working
- Charging with visible internal glow
- Size 9 shim fit and insertion
- Base-of-finger wearing position
- In-app pairing for ring ID 20540
- Live PPG, EDA, temperature, and acceleration streaming
- Session recording
- Cloud sync checkmarks in Senstream
Not yet verified
- charts.senstream.com web portal access
- Long, stable streaming sessions
- Integration with OpenBCI EEG
- Mark Event button behavior
- LED color or pattern meanings
- Exact model printed on the lab package
End-of-session closeout
- Stop and save the recording in Senstream.
- Confirm the session appears in the selected storage location.
- If using Senstream Cloud, confirm the green cloud checkmark.
- Note any “No Finger” interruption or fit change in the session record.
- Return the ring to the magnetic charger when appropriate.