I’m trying to get this to work too and running into problems and I’m only using a single symbol. Unless it’s normal to get a single value for the day (which seems dumb):
Alpha Vantage chart:

Yahoo chart:

This is my config:
sensor:
- platform: alpha_vantage
api_key: !secret alpha_vantage_api_key
symbols:
- symbol: MU
Seems like there might be something wrong with this component because I do see an error message in the logs but I can’t decipher it:
Log Details (ERROR)
Logger: homeassistant.helpers.entity
Source: components/alpha_vantage/sensor.py:154
First occurred: September 9, 2020, 11:03:13 AM (2 occurrences)
Last logged: September 9, 2020, 11:08:08 AM
Update for sensor.mu fails
Traceback (most recent call last):
File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 263, in async_update_ha_state
await self.async_device_update()
File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 456, in async_device_update
await self.hass.async_add_executor_job(
File "/usr/local/lib/python3.8/concurrent/futures/thread.py", line 57, in run
result = self.fn(*self.args, **self.kwargs)
File "/usr/src/homeassistant/homeassistant/components/alpha_vantage/sensor.py", line 154, in update
all_values, _ = self._timeseries.get_intraday(self._symbol)
File "/usr/local/lib/python3.8/site-packages/alpha_vantage/alphavantage.py", line 218, in _format_wrapper
call_response, data_key, meta_data_key = func(
File "/usr/local/lib/python3.8/site-packages/alpha_vantage/alphavantage.py", line 160, in _call_wrapper
return self._handle_api_call(url), data_key, meta_data_key
File "/usr/local/lib/python3.8/site-packages/alpha_vantage/alphavantage.py", line 332, in _handle_api_call
json_response = response.json()
File "/usr/local/lib/python3.8/site-packages/requests/models.py", line 898, in json
return complexjson.loads(self.text, **kwargs)
File "/usr/local/lib/python3.8/site-packages/simplejson/__init__.py", line 525, in loads
return _default_decoder.decode(s)
File "/usr/local/lib/python3.8/site-packages/simplejson/decoder.py", line 370, in decode
obj, end = self.raw_decode(s)
File "/usr/local/lib/python3.8/site-packages/simplejson/decoder.py", line 400, in raw_decode
return self.scan_once(s, idx=_w(s, idx).end())
simplejson.errors.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
What gives?