I am in the middle of a project where two ADS1220 are needed to configure in order to measure three bridge circuits with differential modes. I am using the MSP430f5529 launch pad to configure ADS1220. I tried to set up it with Arduino and was partially successful as some random numbers were popping up. Does anyone have experience dealing with ADS1220?
Thank you in advance
Related
I have this GSM embedded device under linux, where depending on external factors I might chose to put a different sim card into. But in the configuration for the PPP, I have to give an APN, which changes depending on the network du jour. How can I automatize that?
It just downed on me that smartphones don't need explicit APN entry to work when changing the sim card (also, the APN is sometimes different in M2M and actual cell phone, not sure I can use the same trick).
(I know you are curious: it's deployed in the middle of nowhere, and we chose the least worst network at the last minute on the installation site)
You can detect the network operator from the IMSI of the SIM, and have in your device a table mapping operators to APNs.
There are several sites that will provide you an IMSI to operator listing or MCC and MNC to operator listing. The MCC (Mobile Country One) is the first three digits of the IMIS and the MNC (Mobile Network code) the next 2 or 3 digits. Some example links:
https://www.imei.info/carriers/
https://www.mcc-mnc.com
As an aside, if you want to be able to change to adapt to the best available network coverage over time, the way many M2M applications achieve this is to use a 'forgein' SIM which can then roam to the best available signal at a given time. If your data usage requirements are low this can be a good way to avoid being dependent on one operator in an area with poor coverage. There are quite a few companies who specialise in these type of M2M sims, depending on your target location.
I have several Microsoft bands, to be used as part of a group health initiative. I intend to develop a single app on a tablet which will pull the data from the bands. This will be a manual process, there will not be a constant connection to the tablet and no connection to Microsoft Health.
Does anyone know if this is possible?
Thanks
Emma
The general answer is no: Historical sensor values are not stored or buffered on the Band itself.
It does however depend on what sensors you are interested in. The sensor values are not buffered, so you can only read the current (realtime) value of the sensors.
But sensors such as pedometer and distance are incrementing over time, so these values will make sense even though you are only connected once in a while. Whereas for, e.g., the heart rate and skin temperature, you will only get the current (realtime) value.
So it depends on your use case.
I've been writing a LabVIEW program to drive 3 axis Newport SMC-100 stepper motor controller for horizontal, vertical and rotational movement. I've implemented a for loop that repeatedly perform .3 degree turn followed by 5 separate horizontal movement until it turns a full circle. The program always fails at tellcontrollerstatus.vi, and gives me VISA 1073807339 timeout error. When I restart the program, it'll tell me there is no RS-232 connection available. The weird thing is, it happens at various loop iteration.
I'm sure the COM port setting is correct. If it's a simple program that tells the rotational stage to make a full turn in 1000 steps, it doesn't have any problem. It's only when I try to control two axes in each loop that I have problem.
I tried implementing delay using flat sequence but it doesn't really help. Eventually, I gave up changing the program and just tried another USB-RS-232 adapter cable. Then the problem is gone.
Although the problem was solved, it's not based on good diagnostic procedure and seems to be sheer luck. I'd like to know if there is a proper way to diagnose this kind of problem?
I always use addrcom to diagnose port.
http://www.ontrak.net/adrcom.htm
Also, you can short circuit pin 2 with 3 on DB9 and see weather do you receive the same data you have sent over COM. If you do so it means that your USB-RS-232 adapter cable working properly.
I am planning to do a project on WIFI offloading using Software Defined Networking. Basically to switch the signals from WIFI to LTE and vice-versa based on the signal strength. Could anybody let me know how i could simulate this and carry out certain experimental tests? I know there is a software called Mininet and i am not sure if we can create base-stations to simulate the experiments. Is it possible to simulate this using Mininet?
Thanks!
You can sett up some link parameters such as bandwidth and latency in mininiet to "emulate" an wireless base station (LTE/WIFI). However, I'm not quite sure how you should emulate signal strength. You could of course write a program with a "node" that moves around on a 3 axis graph where the x,y,z values could give some signal strength value based on output effect multiplied with the vector found in the graph, and when it reaches a threshold have it change to a node (mininet link) that is closer. I.e. change the forwarding tables so your "stream"/tunnel uses another link.
I did an undergraduate thesis on wireless network emulation in Mininet and used Mininet and Ns-3 together using this project. We primarily did validity testing on this platform to determine it's accuracy and limitations (especially at scale). The wireless model is very good until a very clear performance degradation when the CPU usage reaches (100/n)% - where n is the number of available cores on the machine (for a single threaded implementation).
It also has the functionality to set up multiple base stations, although I didn't delve deeply into this beyond initial testing that it works. The main benefits achieved through this tool is the accurate performance degradation due to distance from the source and interference.
A lot of time has past and it seems better ways are available:
ns-3 has LTE features (it seems it got it through LENA)
for mininet-wifi, here, here and here
I'm making an application for a running competition on a fixed track. I'm investigating what systems could be used and tough of using a stick containing a GPS/DGPS module and a Zigbee enabled chip to communicate the location to a server.
I've researched the subject (on the internet) but I was wondering if anyone has some practical advice/experience with using a Zigbee mesh/star topology in a dynamic environment wich could apply to this use case. I'm also very interested in using a mesh topology where the data is transmitted (hopping) trough the different Zigbee modules to the server.
Runners are holding a stick; run around the track and than pass the stick on to the next team member.
I am not particularly clear about your goal. But I'd like to say a few things.
First, using GPS/DGPS to measure which team reaches the finish line is inaccurate. Raw GPS data is horrible in accuracy (varying in 1 - 10 meters, well, around that), also the sampling rate of a GPS module is low (say once a second?) How do you determine exactly which team reaches the finish line first?
Second, to use a mobile ZigBee chip to communicate in real-time is hard. I assume your stick has a ZigBee end device. When it is moving (which in your case is pretty fast), it must dynamically find and associate with new parent routers, which takes time and depending on the wireless environment, it might involve several retries. So you will imagine a packet is only successfully delivered to the other end after 100ms or even a second. This might not be a problem if your stick records the exact time when a team reaches the finish line. Since you have a GPS module in the stick so there is no problem in getting very accurate time.