@robmarkcole Hi wondering, if you have completed the project. We are also trying to connect camera(with low resolution) to Lopy4 and obtain the still image, convert into ASCII, break down into chunks and send it through LoRa.
Would appreciate your guidance on how you did.
Thankyou
Regards
Sonam
@Terry666 You can derive that from math.log()
math.log10(x) = math.log(x)/math.log(10)
math.log2(x) = math.log(x)/math.log(2)
Since math.log(10) and math.log(2) are constant, you can pre-calculate them.
P.S.: Looking at the code, they are not included in the PyCom build. You can do so by building you own firmware and setting
#define MICROPY_PY_MATH_SPECIAL_FUNCTIONS (1)
in mpconfigport.h.
@tttadam
If you have trouble with fragmentation, you have to redesign your program. Running the garbage collector will not help in all situations and small changes can get you into trouble again.
You can reduce fragmentation by using precompiled scripts and allocating huge buffers at early stages. Reinitialize your buffers instead of allocating them each time.
@robert-hh what I see in the docs is ujson, and I think it is very basic. But I will search for some sample code, and write what I come up with.
(last year when I checked this topic, there was no support for json in micropython. Or I was lazy when did my research)
Json on the sd is come up to my mind also for config, I will give a try with that. :)
I hoped, that there is an easier solution for source code protection, but it seems there isn't. Still thanks for your suggestion.
@misterlisty for instance:
indexs.group(0)
But if you search for a fixed string, you can as well use index, e.g.
try:
found = response.index("2,1")
except:
found = -1
it returns either the position of the string or raises an error.
Actually I think I can do what I need by using mktime() :
t = (2009, 2, 17, 17, 3, 38, 1, 48, 0)
secs = time.mktime( t )
print("time.mktime(t) : %f" % secs)
@misterlisty Not sure of the context exactly, but I am thinking you want to extract the "2,1" from the data returned from the CREG+ AT command? I came up with this to extract the RSSI from the LTE connection and use it in a text string for example..
# Get the current LTE signal quality
squallteM = lteM.send_at_cmd('AT+CSQ').strip().split()
rquallteM = int(squallteM[1].split(',')[0])
# Evaluate the returned signal quality Data
rssilteM = 113 - ((rquallteM) * 2)
ltesqual = ("LTE RSSI: -{} dbM".format(rssilteM))
The .strip() and .split() operators should do what you want.. Hope it helps.
