Made a video of the backyard garden for the first time as a story.
Just out of curiosity, measured the resistance of eggplants and tomato plants. When it is between the edge of a egg plant leaf and stem, the resistance value is about 2MOhm.
Old leaf doesn’t have moisture and it looks like the equivalent resistance of the old leaf is very high (i.e. open circuit). Small and young leaf have less resistance. Depending on the nutrition of the plant, the resistance seems to change.
I can use the tomato as a current limiting resistor to turn on a LED.
Tomato started growing more as the temperature in Oregon started going up.
There are six eggplants and each plant now has a bunch of flowers. At the same time, they attract snails 😛
Green onions. Bought green onions at a grocery store and kept them in a glass of water. Changed water every morning for two weeks and each has enough roots now. So, it was time to plant them outside.
SmartGarden device now is equipped with GPS sensor (Amazon Link) to keep track of real time information – GPS coordinates can be recorded as well. As the device has an USB charger block to power the Arduino microcontroller (Amazon Link) and other sensors, this became a portable device to check out brightness from the light sensor (Amazon Link).
The picture below shows the Analog Three-way meter and my own SmartGarden device.
Again, on a Friday night after work, when we had no plan, why not watch a free movie and eat popcorn with other people in a park. This is a very friendly and safe place to hang around thanks to the City of Portland. On this day (7/12), they had this Movies in the Park event at Colonel Summers Park in East downtown Portland.
How to get there?
It takes about 8 mins drive from downtown Portland. The traffic towards a bridge across Willamette River can get heavy depending on time of a day.
Previously, the smart gardening device was built as an alternative method to the analog three-way meter (amazon link) shown in the picture below.
Using Arduino Software on Windows OS.
The arduino module used in this project is Arduino Micro (Amazon Link).
The data of light sensor output to Arduino are voltage values. In general, when it is brighter, the resistance value of the light sensor becomes smaller. As an example, about 100 Ohm in the sun light and ~ 10M Ohm in darkness.
Arduino microcontroller is programmed so that the log from Arduino produces the voltage value at a node of the light sensor every second. This indicates the brightness captured by the sensor. The data will be shown on the Arduino console and 4-line LCD.
With LED Desk Lamp, Arduino and Light Sensor (Amazon Link).
LED Desk Lamp has 4 light brightness levels
As the desk lamp gets brighter, the voltage value goes down. This means that the resistance of the light sensor goes down.
Test this prototype outside and compare the results with the analog meter.
Every summer in Portland Oregon, Portland Parks and Recreation by the City of Portland offer free movie and live music concerts with local music bands. This is a very friendly event and kids would love it.
The movie starts after dusk (it started around 9:30pm). Free concert starts around 6:30pm.
kids playground, basketball courts and baseball field are there.
Food and Drink?
Free popcorn and food carts are available. Everybody is welcome to bring any outside food.
How was the movie?
The movie was Fantastic Beasts: Crimes Of Grindelwald from 2018. The movie was a little more than 2 hours (2 hr and 13 min). This is the second movie of the “Fantastic Beasts” series. The content is about what happened before Harry Potter. Young Dumbledore was in the movie.
They played the DVD version. The movie started after 9:30 and finished around 11:30. It got very cold. Extra blankets would help.
Introduction | Fort Vancouver is a National Historical Park and they hold a July 4th Fireworks event. This is one of the biggest fireworks at West Coast. They play music while launch fireworks. They start fireworks after 10pm, which is later than other firework places. So, it is a good idea to bring warm cloths to wait for fireworks.
Parking: Free Street Parking on July 4th (Holiday)
Bathroom: Toilets and public restrooms at Visitor Center and Museum
Parking is free on July 4th on street. There would be traffic jam after fireworks, so if possible, I’d recommend to park where you could exit from crowd easily. For example, closer to entrance to highway.
There were a couple of people checking car traffic on Evergreen Blvd. You could park on Reserve St or before the bridge. You need to take a walk to the park.
Food and Gift Shops?
Yes, at Visitor Center and Food Cart. You can bring outside food. There was a bag check at the park entrance.
What to do before fireworks start after 10pm?
The front door to enter the museum after the ticket office was unique. The museum ticket was free on July 4th.
Miniature of Fort Vancouver
When do the fireworks start?
Fireworks started around 10:05pm. It was already cold, so good to bring blankets.