ACCURATELY measuring body temperature "fever" can be an early indicator of Covid-19. If people with a fever self isolate it can help prevent the spread.
Our goal is to use hardware and software to help organizations comply with Covid-19 temperature screening processes.
I recently had a troubling experience when my temperature was being taken using a handheld IR thermometer. My tax preparer's office was very clean, there was sanitizer, people were wearing masks, and she asked all the right questions!
She said wow your temperature is really low, she showed me the display and it was 89.9 F ( 32 C ), I was thinking to myself that either I'm hypodermic or dead! I'm sure she knew something was wrong with the reading. The IR thermometer would have probably have had a been better reading if she had operated it correctly and I had allowed her enough time to take a reading.
ACCURATE temperature readings are necessary or they will be misinterpreted and the readings won't be trusted. People need to have confidence in the technology and security so they will participate. Currently it seems like we are asking UNTRAINED people to use potentially INACCURATE tools to screen for Covid-19.
Our goal is build tools to help people take ACCURATE body temperature measurements. These screening processes can be life saving. According to The New York Times "'Thermometer Guns' on Coronavirus Front Lines Are 'Notoriously Not Accurate'". According to SHRM "if employers want to take workers' temperatures, they should pay employees sent home for high temperatures to limit any legal risk, if they can afford to do". https://www.shrm.org/ResourcesAndTools/legal-and-compliance/employment-law/Pages/EEOC-coronavirus-temperature.aspx
I) Our primary goal - bring to market an inexpensive BLE Thermometer that meets the Bluetooth Standard "Health Thermometer Service" and also meets both the ASTM E1112 and ISO 80601 standards for medical thermometers.
I would challenge anyone out there to build an inexpensive ACCURATE BLE Thermometer that meets the Bluetooth Standard "Health Thermometer Service"
The BLE Thermometers should be accurate, reliable, inexpensive and last 10 years with a replaceable coin cell battery. People should be able to continue to use the Thermometers after the current crisis has passed.
Standards to meet and open source implementations:
Bluetooth HTS Health Thermometer Service https://www.bluetooth.com/specifications/gatt/
Nordic Semiconductor Health Thermometer Application. https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v15.2.0%2Fble_sdk_app_hts.html
The governing standards for intermittent electrical patient thermometers are given in ASTM E1112 and ISO-80601-2-56.
II) Our secondary goal - provide basic software tools to integrate Covid-19 compliance.
I recently went to the dentist a couple times and had to fill out a Covid-19 Questionnaire with pen and paper each time. These checklists may be handled by multiple people so this process may be a Covid-19 spreader!
Please check out our live prototype Covid-19 Questionnaire at:
This application allows unauthenticated users to fill in a Covid-19 questionnaire and email it using the local email client ( nothing is stored in the cloud ).
There are potentially GDPR and/or HIPAA considerations in storing and handling medical data. Any data stored during the crisis will be destroyed in a timely manner. Some organizations and/or people are more comfortable having a limited amount of their personal data securely stored in the cloud.
We have also built a React-Native version, with authentication, where users can submit data directly to organizations. In some instances small and large organizations may need to store, some of this data, to prove that they have been in compliance.
By automating these processes, we can help provide a safer environment so people can focus on their businesses. Most businesses want to do the right thing, but Covid-19 compliance can be difficult.
Open source standards for UI:
React-Native for common code base for Web, Android and iOS.
Already using AWS Amplify libraries to manage Full Stack applications.
GraphQL is an open-source data query and manipulation language for APIs.
Bluetooth HTS Health Thermometer Service - The software to capture the body temperature should work with any device that meets this standard.
III) Power - Since the TI LMT70 temperature sensor is very low power, and the nRF52 is very low power, the battery life should exceed 3 years.
We want to use the Nordic Power Profiler tools to optimize power consumption. https://devzone.nordicsemi.com/nordic/power/w/opp
Batteries being evaluated:
CR2032 Capacity 220 mAh (20mm x 3.2mm)
CR1632 Capacity 120 mAh (16mm x 3.2mm) preffered
Temperature Sensor - https://www.ti.com/lit/ds/symlink/lmt70.pdf
Low Power Supply Current: 9.2 µA (typ)12 µA ( Note that the sensor may be powered off to save even more power )
Micro Controller - https://infocenter.nordicsemi.com/pdf/nRF52832_PS_v1.1.pdf
Radio 5.3 mA peak current in TX (0 dBm)
Radio 5.4 mA peak current in RX
nRF52 58 μA/MHz running from flash memory
nRF52 Sleep 1.9 μA at 3 V in ON mode, no RAM retention, wake on RTC
Conclusion: There are hundreds of temperature sensors that are commonly used with microelectronics but building a thermometer with 0.1 C accuracy is challenging. We intend to move forward building prototypes quickly to try to help with the current Covid-19 crisis.
We are out of time, we planned on providing more detail but this should guide anyone who is interested.