Hello.
I would like to ask how to use the IDG300 dual axis gyro. I’ve read the datasheet and it didn’t answer my question. I thought it would be the same as reading an accelerometer since it is rationometric. However the idg300 is not. So how do I turn the electric signals into an angle? Do I use an adc and use arcsin(current/old).
fvig2001:
Hello.I would like to ask how to use the IDG300 dual axis gyro. I’ve read the datasheet and it didn’t answer my question. I thought it would be the same as reading an accelerometer since it is rationometric. However the idg300 is not. So how do I turn the electric signals into an angle? Do I use an adc and use arcsin(current/old).
You use an ADC, just like with the accelerometers. The ratiometric thing just means that with the accelerometer, its readings are proportional to the supply voltage – the zero-g reading will always be exactly half of the supply voltage (1.5V at 3V supply, 1.65V at 3.3V supply). The IDG300 isn’t ratiometric, so its zero-rate output will be the same whether you give it 3V or 3.3V (it will give you 1.5V in both cases).
Remember that it doesn’t give you an absolute angle, it just tells you (roughly) how quickly you’re turning at the time you take the reading. Say you take 20 readings per second, and you get a reading of 1.68V. 1.68-1.5V = 0.18V, and the gyro output changes 2mV/degree/second, so you’re rotating at 0.18/0.002 = 90 degrees per second in the positive direction. Since you’re taking readings 20 times per second, this means you’ve rotated 90/20 = 4.5 degrees since you last took a reading. If you keep summing up these angles, you can keep track of your current angle.
Be aware that these gyros are subject to “drift”–if you base your angle estimate only on the gyro readings, so after a few seconds of this, the error starts to get significant. After a few tens of seconds, you can count on the your angle estimate having no bearing on reality. People usually find a way to correct the gyro readings with an accelerometer/magnetometer/gps etc. to deal with this drift.
Hi
I am also looking at using an IDG300. I was just wondering what filtering I need (as in low pass or high pass) and what the cut off frequencies should be. I am using it on a hover platform. Any ideas? If you have any other handy info it would also be much appreciated.
Thanks
Hi all…
I too am working on developing a INS system using IDG300. What i need to know is how the output reading for a fixed rotational rate would differ in situations where there is no linear acceleration and there is a linear acceleration. Can anybody provide me with a good reference? Thank you!
gyros have limited sensitivity coefficient for linear acceleration.
hi!
I know gyros output voltage is not ratiometric but ı want to detect turn angle around the yaw axis. ı can find roll and pitch angel by accl.+gyro+ kalman but I have not been succesful about yaw angle detection yet. please help and idea!
eakkas:
hi!I know gyros output voltage is not ratiometric but ı want to detect turn angle around the yaw axis. ı can find roll and pitch angel by accl.+gyro+ kalman but I have not been succesful about yaw angle detection yet. please help and idea!
the conventional method is using magnetometer
ı hink that before but is it effective for that application and can it be used like accelerometer to correct the angle at kalman filtering. And finally which magnetometer do you advice…?
IDG-300 Is The Only Integrated Dual-Axis Gyroscope In The World Targeting Motion-Enabled Applications For Consumer Electronics
SUNNYVALE, Calif. – InvenSense, Inc. (www.invensense.com), the leading provider of integrated motion sensing solutions for consumer electronics, today announced the availability of the IDG-300 dual-axis gyroscope. The IDG-300 integrates dual-axis sensing, 500 degree-per-second full scale range, high-level output signal conditioning and 10,000 G shock resistance. The IDG-300 addresses the widespread and fast growing need for motion-enabled products such as air mice, 3D remotes and game controllers.
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The IDG-300 is the world’s first integrated MEMS gyroscope product family that addresses the consumer electronics market by providing low cost, small size and robust design to meet the demands of handheld products. Based on InvenSense’s proprietary and patented Nasiri-Fabrication process, the IDG-300 is an integrated dual-axis (X- & Y- axis) solution using proven silicon technology and offering the best performance in the smallest foot print. The IDG-300 comes in a small 6x6x1.4mm QFN package, has ±1V full scale output and is factory calibrated to better than ±5% sensitivity.
Due to its patented vibrating dual mass tuning fork technology, it offers a high degree of signal rejection of any linear acceleration and/or external vibration noise. With millions of units already shipped to major OEM companies around the globe, InvenSense’s IDG product family is suitable for the most demanding customers. Other consumer grade gyroscopes are single axis designs with low level outputs and are based on assembly of many discrete components at the package level, by attaching quartz or ceramic sensing elements using epoxy. Due to their delicate packaging and assembly requirements, these gyroscopes are highly susceptible to shock due to normal drops from even small heights on hard surfaces and are also sensitive to high humidity. The IDG-300, using patented Nasiri-Fabrication, provides a fully integrated solution that combines the sensing elements and the electronics at the wafer level, while achieving complete hermetic sealing of all the critical sensing features. InvenSense’s solution requires no assembly of discrete electronic or sensing components at the package level. It uses 100% bulk silicon and its hermetically sealed construction makes it inherently more reliable because it is resistant to shock and humid environments.
The market for in-air mice and 3D remote controllers has been growing due to on-demand content and programming offered by cable companies in addition to web-enabled home media centers. The availability of such content has created the real need for more user friendly navigation to more intuitively perform web searches, movie and music down loads, photo sharing and channel selection. Mastering a 50+ button remote control is very tedious, but with air mice and 3D remote controls, navigating content can be reduced to a simple point and click function.
Gyroscopes are the key enabling technology for providing motion sensing to drive these applications. Due to their unique ability to sense only rotation on their sense axis, they provide the most accurate and absolute motion related information. Low cost and high performance gyroscopes have already been incorporated into a number of other consumer electronics products such as digital still cameras for image stabilization, portable navigation devices for GPS dead reckoning and remote controlled toys.
“InvenSense is the only company in the world focused on providing motion sensing solutions specifically for the consumer electronics market, and manufacturers around the world are benefiting along with their customers. The 3D remote controller and mouse markets are fast growing and important markets and we intend to provide the support to ensure they flourish,” said Joseph Jiang, Vice President of Marketing for InvenSense. “Our dual-axis gyroscope products are in the design-in phase with many leading peripheral providers and the first 3D mouse product that is using our solution is now available.”