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Re: Tricopter Software

 by waltr ¦  Thu Sep 25, 2014 6:48 am ¦  Forum: Arduino ¦  Topic: Tricopter Software ¦  Replies: 52 ¦  Views: 3309

As for code size of 1.7 verse 2.3: If it compiles and fits into the Atmega processor then who cares if there are more features. If you do not enable feature in the CONFIG.H file by uncommenting them then they do not get added to the code loaded into the Atmega. And if you don't enable features in th...

Re: Tricopter Software

 by waltr ¦  Wed Sep 24, 2014 11:57 am ¦  Forum: Arduino ¦  Topic: Tricopter Software ¦  Replies: 52 ¦  Views: 3309

The issue seems to be one with MultiWii. There is a whole web site, Wiki, repository, tutorials and forum for MultiWii. Also, why MW v1.7????? This is ancient. The current version is 2.3 and can be found in the Download section of the MW web site. This comes as a ZIP file that includes everything ne...

Re: newbie needs help with "easy" project

 by waltr ¦  Wed Sep 24, 2014 11:51 am ¦  Forum: Projects ¦  Topic: newbie needs help with "easy" project ¦  Replies: 18 ¦  Views: 1224

I think either a piezo or mic will work. Both would need signal conditioning that includes a Voltage clamp (TVS + resistor). The mic would need other sound proofing so that other external noise is not picked up. The electronics could be a package that is not mounted to the target plate but still beh...

Re: newbie needs help with "easy" project

 by waltr ¦  Tue Sep 23, 2014 7:25 am ¦  Forum: Projects ¦  Topic: newbie needs help with "easy" project ¦  Replies: 18 ¦  Views: 1224

What about: a microphone or accelerometer on the back of the steel plates. Either could easily sense the impact. Since you have line-of-sight to the target and both ends at fixed then a low power TX with directional antennas on both the TX and RX will easily get the range for the RF link. There for ...

Re: Questions on the MP-6050 sensitivity and linear velocity

 by waltr ¦  Mon Sep 22, 2014 6:50 am ¦  Forum: Arduino ¦  Topic: Questions on the MP-6050 sensitivity and linear velocity ¦  Replies: 3 ¦  Views: 553

2-Is there a way to obtained linear velocity from the accelerometer data? I am trying to know how fast my robot is moving.
No, a constant linear velocity has ZERO acceleration.
Use wheel sensors as suggested by Valen.

Re: Mabuchi RS 540RH motor/SN754410 REALLY HOT!!

 by waltr ¦  Thu Sep 18, 2014 7:37 am ¦  Forum: SparkFun Product Questions ¦  Topic: Mabuchi RS 540RH motor/SN754410 REALLY HOT!! ¦  Replies: 4 ¦  Views: 679

There are lots of higher current drivers. Check Pololu for a good selection.

Re: Power for Ardumoto separate from UNO

 by waltr ¦  Wed Sep 17, 2014 6:58 am ¦  Forum: SparkFun Product Questions ¦  Topic: Power for Ardumoto separate from UNO ¦  Replies: 3 ¦  Views: 257

Well for starters, use your Ohmmeter to find out what power pins are connected to which board and where.
Then only apply the 3S LiPo to the motor drive part of the circuit (do ensure the common (minus battery terminal) is connected to the whole system.

Re: Help! Arduino and Imu

 by waltr ¦  Fri Sep 12, 2014 6:53 am ¦  Forum: Arduino ¦  Topic: Help! Arduino and Imu ¦  Replies: 3 ¦  Views: 459

Are the motor BLDC (BrushLess DC)? Is so then you need a BLDC motor driver circuit. Google this.

Re: Need extra pinout on MAX3232 breakout

 by waltr ¦  Wed Sep 10, 2014 7:11 am ¦  Forum: SparkFun Product Questions ¦  Topic: Need extra pinout on MAX3232 breakout ¦  Replies: 1 ¦  Views: 405

Solder a wire between the IC and the connector.

Re: Operatring bipolar motor using Duel-H Bridge L293D

 by waltr ¦  Tue Sep 09, 2014 7:14 am ¦  Forum: Arduino ¦  Topic: Operatring bipolar motor using Duel-H Bridge L293D ¦  Replies: 3 ¦  Views: 537

An FYI: a BiPolar motor is a STEPPER motor. What I think you have is a DC Brushed motor. Two very different creatures.

Re: RF not working on certain power sources

 by waltr ¦  Mon Sep 08, 2014 10:35 am ¦  Forum: Wireless/RF ¦  Topic: RF not working on certain power sources ¦  Replies: 2 ¦  Views: 450

Did you measure the Voltage with the Cheap PS connected? Since this is a lower current PS it's Voltage may droop.

Re: How to Simulate Differential Pressure Sensor?

 by waltr ¦  Fri Aug 29, 2014 7:38 am ¦  Forum: Projects ¦  Topic: How to Simulate Differential Pressure Sensor? ¦  Replies: 23 ¦  Views: 3032

Ok, dead ends is part of the learning. You now have another tool, LT Spice, to help you on your way.
have fun

Re: How to Simulate Differential Pressure Sensor?

 by waltr ¦  Wed Aug 27, 2014 8:18 am ¦  Forum: Projects ¦  Topic: How to Simulate Differential Pressure Sensor? ¦  Replies: 23 ¦  Views: 3032

You wired the op-amp as a Comparator...........not as a Voltage follower!
The diagram in the data sheet is a SIMPLIFIED diagram. Look up op-amp circuits (comparators and followers) then use LT Spice.

Re: Flat DC Motor for Fan

 by waltr ¦  Mon Aug 25, 2014 9:12 am ¦  Forum: Projects ¦  Topic: Flat DC Motor for Fan ¦  Replies: 4 ¦  Views: 908

maxik wrote:Sorry, I didn't mean those cooler fans you find in PCs. I meant those cheap hand fans you get everywhere. Something like this: http://img.hisupplier.com/var/userImage ... 556526.jpg
Those fans use a very cheap brushed motor (I can see it through the plastic).

Re: How to Simulate Differential Pressure Sensor?

 by waltr ¦  Mon Aug 25, 2014 8:45 am ¦  Forum: Projects ¦  Topic: How to Simulate Differential Pressure Sensor? ¦  Replies: 23 ¦  Views: 3032

Ok, great you got this working and thanks for posting your results.

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