If you’ve done that by hand with an iron then I’m impressed!
I did, using a genuine (verified by Hakko) Hakko FX888D, with the standard tip and some unknown smd solder. I can’t get the out of the holder I 3d printed without breaking it, but it is pretty thin.
Alignment isn’t perfect, but close enough.
2 Likes
That is very cool! I’ve never done any soldering at this scale but I know I will have to soon, if for no other reason than to change the I2C addresses of PCA9685 PWM module boards.
So, I bought this trinocular microscope:
The microscope itself is great!
I bought it because of this recommendation:
I also bought this camera:
…and it’s utter garbage. The field of view is… well… microscopic. No pun intended. The field of view is much, much smaller than what you see through the eyepieces.
Do you have any suggestions?
Edit: Watching the video again, I may have just answered my own question.
You need a different tip and also learn how to correctly drag solder with good quality ‘tacky flux’. It is a walk in the park when you have the right gear and technique. I use a BCM hollow conical tip. Video and guides are at this link.
1 Like
I might get something better, if I need to do more of this. For this I just needed to solder two resistor networks in, and then I might have to solder something like that in a few years again… But this was just for fun to see if I could do it, there was plenty of space to just go with 0805 sized.
With just about 50 lines of code I created the mapping between my shelly roller shutters and the openhab proxy items.
The code
- automatically creates the corresponding openhab rollershutter items
- listens for the mqtt position event, inverts the percentage and posts an update to the openhab item
- listens for commands from openhab, translates them to shelly commands and updates the mqtt topic so the shutter moves
- also adds some small logging
If I add more shutters, I just have to add the device-id in the dict and everything else will happen automatically.
import logging
import re
import time
import typing
from HABApp import Rule
from HABApp.core.items import Item
from HABApp.openhab.events import ItemCommandEvent
from HABApp.mqtt.events import MqttValueChangeEvent
log = logging.getLogger('Rollladen')
class Rollladen(Rule):
def __init__(self, name, device_id):
super().__init__()
self.name = name
self.device_id = device_id
# Set custom rule name so if something goes wrong we know where
self.rule_name = f'Map{self.name}'
self.mqtt_topic_position = f'shellies/shellyswitch25-{self.device_id}/roller/0/pos'
self.run_soon(self.create_items)
self.listen_event(self.name, self.command, ItemCommandEvent)
self.listen_event(self.mqtt_topic_position, self.update_position, MqttValueChangeEvent)
def create_items(self):
# create openhab item
if not self.openhab.item_exists(self.name):
self.openhab.create_item(
item_type='Rollershutter',
item_name=self.name,
# add label with spaces after each uppercase character and percent value
label=re.sub( r"([A-Z])", r" \1", self.name).replace('ae', 'ä').replace('ue', 'ü') + ' [%d %%]',
groups=['Rollladen']
)
# update position initially from cache
self.update_position(self.get_item_state(self.mqtt_topic_position, 0))
def command(self, event):
assert isinstance(event, ItemCommandEvent), event
target = {'UP': 'open', 'DOWN': 'close', 'STOP': 'stop'}.get(event.value, event.value)
target = str(target)
log.info( f'{self.name}: {target}')
self.mqtt.publish(f'shellies/shellyswitch25-{self.device_id:s}/roller/0/command', target)
def update_position(self, value_or_event):
if isinstance(value_or_event, MqttValueChangeEvent):
percent = value_or_event.value
else:
percent = value_or_event
# assert and invert percentage
assert isinstance(percent, (int, float)), type(percent)
self.openhab.post_update(self.name, 100 - percent)
SHELLIES: typing.Dict[str, str] = {
'RollladenZimmer1': 'BARCCA',
'RollladenZimmer2': 'BARCDA'
'RollladenZimmer3': 'BARCEA'
'RollladenZimmer4': 'BARCFA'
}
# create all required rules
for name, value in SHELLIES.items():
Rollladen(name, value)
3 Likes
I wrote a little python script to integrate the control of the apa102 rgb LEDs on a respeaker 2mic pi hat into openhab and Nodered over Mqtt.
Than I build a little box out of wood I had lying around and some old tights from my girlfriend 
which fits the respeaker and the pi zero w it’s attached too.
As I use Snips.ai for voice controlling openhab I can use this as a satellite for it but I can now also trigger the LEDs from Openhab over Mqtt to notify me about other things.
Here are some pictures
Johannes
1 Like
Hi Johannes,
how is your experience with the respeaker pi hat? Can it process what you say directly or how many tries do you need? Also at which distance?
Would be intersting as I might want to order one but it must work for the whole living room.
I didn’t know you could create items from Jython code! Thanks for this incredibly useful piece of knowledge! 
Whilst this is possible with Jython, too, I am running HABApp. It’s “real” Python, provides full syntax highlighting and the possibility to use any python lib with it. You can easily try it out from any machine since there is a config switch makes the connection to your openhab instance in read-only mode and thus will not change anything. Here’s the link to the documentation.
1 Like
It’s quite good up to 3m distance and in a fairly quiet environment. It is better than the Playstation eye cam but as it doesn’t have any audio pre processing it will still struggle with background noises.
If you have really big rooms I d recommend the respeaker mic array v2 (https://www.seeedstudio.com/ReSpeaker-Mic-Array-v2-0.html) as it has integrated audio processing and better far field capabilities.
But you can’t beat the price of the 2mic hat. I got mine for 8€ with shipping from China.
Johannes
Short and sweet post today:
WiFi + MQTT door chime! 
Hard do see the parts in the photo, here they are if you’re curious:
Plus inline fuse holder, wires. That’s all!
I’m driving the solid state relay directly from the RX pin on the ESP-01. I chose the RX pin because it’s the only I/O pin that does not go high during boot-up, which would have caused an unnecessary chime as you power it on.
I struggled for a while with a very small 3V mechanical relay driven by a transistor which was in turn controlled by the ESP-01… but it randomly rebooted sometimes when I controlled the relay. My oscilloscope showed me an insane amount of noise and oscillation on the supply line when I powered the relay. Power supply not liking the impedance change? Maybe. I gave up and went with a solid state relay (and got rid of the transistor too). Problem solved, works perfectly now!
2 Likes
A LED Aluminum Profile included in the ceiling and wall. With an Tunablewhite stripe, controlled by DMX Binding and KNX (self designed) switch (ZENNIO TMD Plus).
3 Likes
Cool switch! How do you use it?
Its a wired KNX Switch. You can use it with the KNX Binding
No, I mean there are 6 buttons on there. They look static, so what is the function of each button? I have a dozen buttons everywhere, if I get visitors, they are always lost
Depends… it’s a Glas Switch. The 6 buttons have a LED behind it which indicates if it’s on or off. The pictures on the buttons shows the function. Main light, color led, roller shutter, music, …
Additionally you can configure a so called “welcome object”. F.e. to turn the light if you just hit the switch in the dark. And the switch has an input, where I added a motion sensor.
So my plan is a kind of “guest modus” option, where the lights just automatically turn on if it’s to dark.
Micro PV System
A few weeks ago I bought myself a micro PV system. It consists of two 275W panels and a matching micro inverter (EVT560). The panels are attached to a small stone wall on our terrace and are fed directly into the house grid for personal use.
The interesting thing is of course to know how much electricity is produced. That’s why I have routed the feed via a Sonoff POW to record the power every 30 seconds.
The right socket is used for feeding in, then goes into the Sonoff and from there into the left socket.
The Sonoff is flashed with the current Tasmota firmware and integrated into openHAB via MQTT. Grafana shows the current performance as a graphic.
Two topics are still open:
- Recording the used kWh .
- Currently a phase is being fed in. But my house electrics uses 3 phases. This means that I could always switch the solar system to the phase with the highest load in order to have the greatest benefit.
If someone has a complete set of rules, items etc. and other hints on the topic, I would be happy. 
1 Like
Splendid!
I was already looking at this kind of lighting for a corrisor but couldn’t find the appropriate profiles…
Could you share the hardqare you used?
Also which KNX module works well with LED stripes and dimming?