Sensing device and report generation web site accessed through dynamic QR codes
A sensing device comprising a battery, sensing devices, programmable controller, memory and user interface capable of displaying a QR code. Code running in the programmable device for recording sensor values and encoding them into a device data string and converting the string into a web site address for requesting a report. A web site with code for decoding the query string, appending user supplied data and time information, and generating a report web page presenting the recorded sensor values.
1. A sensing device comprising:
a first sensor;
a memory;
a controller configured to execute a code to capture sensor measurements from the first sensor and to store the sensor measurements in the memory, the sensor measurements including a series of sensor measurements over time; and
a user interface including a display configured to display an array of pixels,
wherein the controller is configured to cause display of a quick response (QR) code on the display, the QR code encoded with a query string representing the series of sensor measurements over time, wherein a 12-bit sensor measurement is encoded into a pair of base 64 characters.
2. The sensing device of claim 1 , wherein the QR code, when read by a reader device including a reader and a first web site running code that decodes the query string, prompts the reader device to present a first web page.
3. The sensing device of claim 2 , wherein the reader device further presents a second web site in response to receiving the query string generated from the first web site and presenting a report showing the sensor measurements.
4. The sensing device of claim 1 , wherein the array of pixels comprises N×M pixels, and the QR code comprises less than or equal to N×N pixels.
5. The sensing device of claim 4 wherein N is 64 and M is greater than or equal to 64.
6. The sensing device of claim 1 , wherein the sensing device is battery powered.
7. The sensing device of claim 1 , wherein a firmware revision is included in the QR code as encoded data.
8. The sensing device of claim 1 , wherein the sensor is configured to sense CO 2 levels.
9. The sensing device of claim 1 , wherein the sensing device is electronic or mechanical test equipment for measuring some combination of voltage, current, magnetic fields, resistance, capacitance, inductance, power, force, pressure, distance, and angle.
10. The sensing device of claim 1 , wherein the sensor is configured to sense health values for measuring some combination of blood pressure, heart rate, weight, body mass index (BMI), electrocardiogram (EKG), and blood chemistry.
11. The sensing device of claim 1 , wherein the sensor measurements include information about operation of the sensing device to aid in diagnosing failures of the sensing device.
12. The sensing device of claim 1 , wherein an interval between successive time-related sensor measurements is communicated by the QR code.
13. The sensing device of claim 12 , wherein the QR code, when read by a reader device, causes the reader device to display a web page showing a graph of sensor values on one axis and time on another axis.
14. The sensing device of claim 13 , wherein the QR code does not encode a separate time value for each measurement of a sequence of measurement data and a time value for each measurement value is computed based on the interval and a time when a report is generated.
15. The sensing device of claim 1 , wherein a 12-bit value is partitioned into a 2-bit exponent and 10-bit mantissa to represent a sensor measurement with 3 significant digits of resolution.