def footprint():
try:
args = parse_spiral_request()
except Exception as e:
return flask.render_template('error.html', error=str(e))
args['width'] -= args['trace_width']
args['height'] -= args['trace_width']
inductance = flask.request.values.get('inductance', default='')
resistance = flask.request.values.get('resistance', default='')
qfactor = flask.request.values.get('qfactor', default='')
capacitance = flask.request.values.get('capacitance', default='')
coil = list(squarespiral(args['width']/2, args['height']/2, args['pitch'],
args['turns']))
description = 'PCB inductor {}m x {}m {} turns {}m pitch'.format(
format_si_prefix(args['width']*1e-3),
format_si_prefix(args['height']*1e-3),
args['turns'], format_si_prefix(args['pitch']*1e-3))
description += ' inductance {} Q={} at {}Hz'.format(
inductance, qfactor, args['frequency'])
description += ' generated with https://github.com/ignamv/kicad_scripts'
response = flask.Response(mimetype='text/plain',
headers=[('Content-disposition',
'attachment; filename = pcbantenna.kicad_mod')])
write_trace_footprint(response.stream, 'PCBAntenna', description,
coil, args['trace_width'], args['pad_size'])
return response
def calculate():
if flask.request.values.get('download', type=bool, default=False):
return footprint()
try:
args = parse_spiral_request()
except Exception as e:
return dict(success=False, error=str(e))
args['width'] -= args['trace_width']
args['height'] -= args['trace_width']
coil = ((x, y, 0) for x,y in squarespiral(args['width']/2, args['height']/2,
args['pitch'], args['turns']))
try:
impedance = coil_impedance(coil, args['trace_width'],
args['trace_height'],
args['frequency'],
'./fasthenry')
except TimeoutExpired:
return dict(success=False, error='Calculations took too long')
angfreq = 2 * math.pi * args['frequency']
resistance = format_si_prefix(impedance.real) + 'Ω'
inductance = format_si_prefix(impedance.imag / angfreq) + 'H'
qfactor = '{:.2g}'.format(impedance.imag / impedance.real)
capacitance = format_si_prefix(1 / (angfreq * impedance.imag)) + 'F'
args.update(resistance=resistance, inductance=inductance, qfactor=qfactor,
capacitance=capacitance)
return dict(success=True, resistance=resistance, inductance=inductance,
qfactor=qfactor, capacitance=capacitance,
download=flask.url_for('footprint', **args))
pitch = args.separation + trace_width
pitch *= args.scale
zpitch = args.zpitch * args.scale
if args.pad_size is None:
pad_size = trace_width
else:
pad_size = args.pad_size * args.scale
if args.thickness is not None:
trace_height = args.thickness * args.scale
else:
# 1 oz/ft² copper is 1.5 mils thick = .03406 mm
trace_height = args.weight * .03406
if args.shape == 'square':
coil = spiral.squarespiral(side1, side2, pitch, args.turns)
else:
coil = spiral.ellipticalspiral(side1, side2, pitch, args.turns,
args.vertices_per_turn)
coil = list((x * args.mirror, y) for x,y in coil)
if args.fasthenry:
angfreq = 2 * math.pi * args.frequency
Z = coil_impedance(((x,y,ii*zpitch/4) for ii, (x,y) in enumerate(coil)),
trace_width, trace_height, args.frequency)
L = Z.imag / angfreq
C = 1 / (angfreq * Z.imag)
Q = Z.imag / Z.real
print('Analysis of {}m x {}m {}-turn {}m pitch {}m trace inductor at {}Hz\n'.format(
si_prefix_format(side1*2e-3), si_prefix_format(side2*2e-3), args.turns,
si_prefix_format(pitch*1e-3), si_prefix_format(trace_width*1e-3),
pitch = args.separation + trace_width
pitch *= args.scale
zpitch = args.zpitch * args.scale
if args.pad_size is None:
pad_size = trace_width
else:
pad_size = args.pad_size * args.scale
if args.thickness is not None:
trace_height = args.thickness * args.scale
else:
# 1 oz/ft² copper is 1.5 mils thick = .03406 mm
trace_height = args.weight * .03406
if args.shape == 'square':
coil = spiral.squarespiral(side1, side2, pitch, args.turns)
else:
coil = spiral.ellipticalspiral(side1, side2, pitch, args.turns,
args.vertices_per_turn)
coil = list((x * args.mirror, y) for x, y in coil)
if args.fasthenry:
angfreq = 2 * math.pi * args.frequency
Z = coil_impedance(
((x, y, ii * zpitch / 4) for ii, (x, y) in enumerate(coil)),
trace_width, trace_height, args.frequency)
L = Z.imag / angfreq
C = 1 / (angfreq * Z.imag)
Q = Z.imag / Z.real
print(
'Analysis of {}m x {}m {}-turn {}m pitch {}m trace inductor at {}Hz\n'.